增加回复与待审提醒：站内消息与 SMTP 邮件通知。

Co-authored-by: Cursor <cursoragent@cursor.com>

ROADMAP.md

@@ -30,7 +30,6 @@ _当前无已记录缺陷。发现新问题请在本仓库提交 Issue。_
 |--------|------|------|
 | 中 | 通知动态优化 | 右栏最新评论的展示与交互 |
 | 低 | 帖子搜索增强 | 标题/正文/作者组合筛选 |
-| 低 | 邮件通知 | 回复提醒（需 SMTP 配置） |
 
 ---
 
@@ -59,6 +58,8 @@ _当前无公开认领任务。_
 - [x] 楼层式评论、引用回复、@ 高亮
 - [x] 点赞、收藏、热门帖
 - [x] 敏感词过滤、发帖限流
+- [x] 站内私信
+- [x] 回复提醒与待审提醒（站内消息 + SMTP 邮件）
 - [x] SQLite 备份、单二进制部署
 
 ---

frontend/src/components/RightPanel.tsx

@@ -4,6 +4,7 @@ import { Skeleton } from '@/components/ui/skeleton';
 import type { PostItem, RecentComment, TagCount, User } from '../api/types';
 import type { PostHeading } from '../utils/postHeadings';
 import { useSiteBranding } from '../hooks/useSiteBranding';
+import { formatShortDateTime } from '../utils/content';
 import TagCloud from './TagCloud';
 import UserLink from './UserLink';
 import ArticleOutline from './ArticleOutline';
@@ -213,7 +214,7 @@ export default function RightPanel({
                   onClick={() => onPostClick(item.post_id, item.floor > 0 ? { floor: item.floor } : undefined)}
                 >
                   <span className="widget-item-title">{item.excerpt}</span>
-                  <span className="widget-item-time">{item.created_at}</span>
+                  <span className="widget-item-time">{formatShortDateTime(item.created_at)}</span>
                 </button>
               </div>
             ))}

frontend/src/pages/MessagesPage.tsx

@@ -19,6 +19,8 @@ function kindLabel(kind: string) {
   switch (kind) {
     case 'reject': return '拒帖通知';
     case 'report_result': return '举报结果';
+    case 'reply': return '回复提醒';
+    case 'moderation': return '待审提醒';
     case 'system': return '系统通知';
     default: return '';
   }

frontend/src/utils/content.ts

@@ -43,6 +43,14 @@ export function formatDateTime(iso: string) {
   return `${d.getFullYear()}年${d.getMonth() + 1}月${d.getDate()}日 ${pad(d.getHours())}:${pad(d.getMinutes())}`;
 }
 
+/** 短日期时间（本地时区）：MM-DD HH:mm，用于右栏最新评论等 */
+export function formatShortDateTime(iso: string) {
+  const d = new Date(iso);
+  if (Number.isNaN(d.getTime())) return iso;
+  const pad = (n: number) => String(n).padStart(2, '0');
+  return `${pad(d.getMonth() + 1)}-${pad(d.getDate())} ${pad(d.getHours())}:${pad(d.getMinutes())}`;
+}
+
 /** 判断两个 ISO 时间是否相差超过 1 分钟 */
 export function isTimeDiffSignificant(a: string, b: string) {
   const da = new Date(a).getTime();

handler/api.go

@@ -303,6 +303,12 @@ func (h *Handlers) APIAdminApproveComment(c *gin.Context) {
 		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
 		return
 	}
+	if h.Notify != nil {
+		if comment, err := h.Comment.GetByID(uint(id)); err == nil {
+			comment.Status = model.ContentStatusPublished
+			h.Notify.AsyncNotifyCommentPublished(comment)
+		}
+	}
 	c.JSON(http.StatusOK, gin.H{"message": "评论已通过审核", "status": model.ContentStatusPublished})
 }
 

handler/handlers.go

@@ -24,6 +24,7 @@ type Handlers struct {
 	Post      *service.PostService
 	Comment   *service.CommentService
 	Message   *service.MessageService
+	Notify    *service.NotifyService
 	Report    *service.ReportService
 	Backup    *service.BackupService
 	Filter    *service.SensitiveFilter
@@ -322,6 +323,9 @@ func (h *Handlers) APICreatePost(c *gin.Context) {
 	msg := "发帖成功"
 	if post.Status == model.ContentStatusPending {
 		msg = "已提交审核，通过后将公开显示"
+		if h.Notify != nil {
+			h.Notify.AsyncNotifyPendingPost(post)
+		}
 	}
 	c.JSON(http.StatusOK, gin.H{"message": msg, "post_id": post.ID, "status": post.Status})
 }
@@ -329,12 +333,19 @@ func (h *Handlers) APICreatePost(c *gin.Context) {
 func (h *Handlers) APIUpdatePost(c *gin.Context) {
 	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
 	boardID, _ := strconv.ParseUint(c.PostForm("board_id"), 10, 64)
-	err := h.Post.Update(h.currentUserID(c), uint(id), h.isAdmin(c),
+	isAdmin := h.isAdmin(c)
+	err := h.Post.Update(h.currentUserID(c), uint(id), isAdmin,
 		c.PostForm("title"), c.PostForm("content"), c.PostForm("tags"), c.PostForm("post_type"), uint(boardID))
 	if err != nil {
 		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
 		return
 	}
+	// 普通用户修改后重新进入审核
+	if !isAdmin && h.Notify != nil {
+		if post, getErr := h.Post.FindByID(uint(id)); getErr == nil {
+			h.Notify.AsyncNotifyPendingPost(post)
+		}
+	}
 	c.JSON(http.StatusOK, gin.H{"message": "帖子已更新"})
 }
 
@@ -414,7 +425,15 @@ func (h *Handlers) APICreateComment(c *gin.Context) {
 		return
 	}
 	msg := "评论成功"
-	if comment.Status == model.ContentStatusPending {
+	if h.Notify != nil {
+		switch comment.Status {
+		case model.ContentStatusPublished:
+			h.Notify.AsyncNotifyCommentPublished(comment)
+		case model.ContentStatusPending:
+			msg = "评论已提交，审核通过后公开显示"
+			h.Notify.AsyncNotifyPendingComment(comment)
+		}
+	} else if comment.Status == model.ContentStatusPending {
 		msg = "评论已提交，审核通过后公开显示"
 	}
 	c.JSON(http.StatusOK, gin.H{"message": msg, "floor": comment.Floor, "id": comment.ID, "status": comment.Status})
@@ -432,7 +451,7 @@ func (h *Handlers) APIDeleteComment(c *gin.Context) {
 func (h *Handlers) APIUpdateComment(c *gin.Context) {
 	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
 	content := c.PostForm("content")
-	saved, err := h.Comment.Update(h.currentUserID(c), uint(id), h.isAdmin(c), content)
+	saved, enteredPending, err := h.Comment.Update(h.currentUserID(c), uint(id), h.isAdmin(c), content)
 	if err != nil {
 		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
 		return
@@ -444,6 +463,9 @@ func (h *Handlers) APIUpdateComment(c *gin.Context) {
 		if status == model.ContentStatusPending && !h.isAdmin(c) {
 			msg = "评论已更新，审核通过后公开显示"
 		}
+		if enteredPending && h.Notify != nil {
+			h.Notify.AsyncNotifyPendingComment(comment)
+		}
 	}
 	c.JSON(http.StatusOK, gin.H{"message": msg, "content": saved, "status": status})
 }

model/models.go

@@ -166,6 +166,8 @@ const (
 	MessageKindSystem       = "system"        // 系统通知
 	MessageKindReject       = "reject"        // 帖子被拒/下架
 	MessageKindReportResult = "report_result" // 举报处理结果
+	MessageKindReply        = "reply"         // 帖子/评论被回复
+	MessageKindModeration   = "moderation"    // 新内容待审核（通知管理员）
 )
 
 // PrivateMessage 站内私信

router/router.go

@@ -54,6 +54,7 @@ func Setup(cfg *config.Config) (*gin.Engine, error) {
 	captchaSvc := service.NewCaptchaService()
 	mailSvc := service.NewMailService(settingsSvc)
 	emailCodeSvc := service.NewEmailCodeService(mailSvc)
+	notifySvc := service.NewNotifyService(messageSvc, mailSvc, settingsSvc)
 	oidcSvc, err := service.NewOIDCService(cfg, settingsSvc)
 	if err != nil {
 		return nil, err
@@ -78,7 +79,7 @@ func Setup(cfg *config.Config) (*gin.Engine, error) {
 
 	h := &handler.Handlers{
 		Cfg: cfg, Store: uploadStore, Auth: authSvc, User: userSvc, Board: boardSvc,
-		Post: postSvc, Comment: commentSvc, Message: messageSvc, Report: reportSvc,
+		Post: postSvc, Comment: commentSvc, Message: messageSvc, Notify: notifySvc, Report: reportSvc,
 		Backup: backupSvc,
 		Filter: filter, Limiter: limiter, Settings: settingsSvc,
 		Captcha: captchaSvc, Mail: mailSvc, EmailCode: emailCodeSvc,

service/comment.go

@@ -273,32 +273,33 @@ func (s *CommentService) Delete(userID, commentID uint, isAdmin bool) error {
 	return s.AdminDelete(commentID)
 }
 
-func (s *CommentService) Update(userID, commentID uint, isAdmin bool, content string) (string, error) {
+func (s *CommentService) Update(userID, commentID uint, isAdmin bool, content string) (string, bool, error) {
 	var comment model.Comment
 	if err := model.DB.First(&comment, commentID).Error; err != nil {
-		return "", ErrCommentNotFound
+		return "", false, ErrCommentNotFound
 	}
 	if !isAdmin && (comment.UserID == 0 || comment.UserID != userID) {
-		return "", ErrPermissionDenied
+		return "", false, ErrPermissionDenied
 	}
 	if !isAdmin {
 		window := s.settings.CommentEditWindowMinutes()
 		if window > 0 && time.Since(comment.CreatedAt) > time.Duration(window)*time.Minute {
-			return "", errors.New("已超过可编辑时限")
+			return "", false, errors.New("已超过可编辑时限")
 		}
 	}
 
 	content = s.filter.Filter(strings.TrimSpace(content))
 	if content == "" {
-		return "", errors.New("评论内容不能为空")
+		return "", false, errors.New("评论内容不能为空")
 	}
 	if err := s.settings.ValidateTextLength(content, s.settings.CommentMax(), ErrCommentTooLong); err != nil {
-		return "", err
+		return "", false, err
 	}
 	if content == comment.Content {
-		return content, nil
+		return content, false, nil
 	}
 
+	enteredPending := false
 	err := model.DB.Transaction(func(tx *gorm.DB) error {
 		rev := model.CommentRevision{
 			CommentID: commentID,
@@ -311,13 +312,14 @@ func (s *CommentService) Update(userID, commentID uint, isAdmin bool, content st
 		updates := map[string]interface{}{"content": content}
 		if !isAdmin {
 			updates["status"] = model.ContentStatusPending
+			enteredPending = true
 		}
 		return tx.Model(&comment).Updates(updates).Error
 	})
 	if err != nil {
-		return "", err
+		return "", false, err
 	}
-	return content, nil
+	return content, enteredPending, nil
 }
 
 func (s *CommentService) AdminDelete(commentID uint) error {
@@ -401,7 +403,8 @@ func (s *CommentService) ListRecentPublic(limit int) ([]RecentCommentItem, error
 			Avatar:    avatar,
 			Excerpt:   excerpt,
 			PostTitle: c.Post.Title,
-			CreatedAt: c.CreatedAt.Format("01-02 15:04"),
+			// 返回 UTC ISO，由前端按本地时区展示（避免与后台差 8 小时）
+			CreatedAt: c.CreatedAt.UTC().Format(time.RFC3339),
 		})
 		if len(out) >= limit {
 			break

service/mail_template.go

@@ -92,3 +92,212 @@ func BuildRegisterCodeMail(siteName, code string, ttlMinutes int) (subject, text
 	)
 	return subject, textBody, htmlBody
 }
+
+// BuildReplyMail 生成「收到新回复」提醒邮件
+// displayFloor 为页面可见顶层楼号；底部展示帖子主题，不展示路径 URL。
+func BuildReplyMail(siteName, authorName, postTitle string, displayFloor int, isNested bool, excerpt, link string) (subject, textBody, htmlBody string) {
+	siteName = strings.TrimSpace(siteName)
+	if siteName == "" {
+		siteName = "姜十三论坛"
+	}
+	authorName = strings.TrimSpace(authorName)
+	if authorName == "" {
+		authorName = "有人"
+	}
+	postTitle = strings.TrimSpace(postTitle)
+	if postTitle == "" {
+		postTitle = "未知帖子"
+	}
+
+	subject = fmt.Sprintf("【%s】收到新回复", siteName)
+	bodyLine := FormatReplyContent(authorName, postTitle, displayFloor, isNested)
+
+	textBody = fmt.Sprintf("你好，\n\n%s\n", bodyLine)
+	if excerpt != "" {
+		textBody += "\n摘要：\n" + excerpt + "\n"
+	}
+	textBody += fmt.Sprintf("\n帖子：《%s》\n", postTitle)
+	if link != "" {
+		textBody += "链接：" + link + "\n"
+	}
+	textBody += fmt.Sprintf("\n— %s\n", siteName)
+
+	safeSite := html.EscapeString(siteName)
+	safeBody := html.EscapeString(bodyLine)
+	safeTitle := html.EscapeString(postTitle)
+	safeExcerpt := html.EscapeString(excerpt)
+	safeLink := html.EscapeString(link)
+	preheader := html.EscapeString(fmt.Sprintf("%s 回复了你在《%s》中的内容", authorName, postTitle))
+
+	linkBlock := ""
+	if link != "" {
+		linkBlock = fmt.Sprintf(`
+              <p style="margin:0 0 12px;text-align:center;">
+                <a href="%s" style="display:inline-block;padding:10px 18px;background:#18a058;color:#ffffff;text-decoration:none;border-radius:8px;font-size:14px;font-weight:600;">查看讨论</a>
+              </p>`, safeLink)
+	}
+	excerptBlock := ""
+	if excerpt != "" {
+		excerptBlock = fmt.Sprintf(`
+              <table role="presentation" width="100%%" cellpadding="0" cellspacing="0" style="margin:0 0 20px;background:#f8fafc;border-radius:8px;">
+                <tr>
+                  <td style="padding:12px 14px;font-size:13px;line-height:1.6;color:#4b5563;">%s</td>
+                </tr>
+              </table>`, safeExcerpt)
+	}
+
+	htmlBody = fmt.Sprintf(`<!DOCTYPE html>
+<html lang="zh-CN">
+<head>
+<meta charset="UTF-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
+<title>%s</title>
+</head>
+<body style="margin:0;padding:0;background:#f5f7fa;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;color:#1f2937;">
+  <div style="display:none;max-height:0;overflow:hidden;opacity:0;color:transparent;mso-hide:all;">%s</div>
+  <table role="presentation" width="100%%" cellpadding="0" cellspacing="0" style="background:#f5f7fa;padding:28px 12px;">
+    <tr>
+      <td align="center">
+        <table role="presentation" width="100%%" cellpadding="0" cellspacing="0" style="max-width:520px;background:#ffffff;border-radius:12px;border:1px solid #e5e7eb;overflow:hidden;">
+          <tr>
+            <td style="padding:20px 28px;background:linear-gradient(135deg,#18a058,#138f4c);color:#ffffff;">
+              <div style="font-size:18px;font-weight:700;letter-spacing:0.02em;">%s</div>
+              <div style="margin-top:4px;font-size:13px;opacity:0.92;">回复提醒</div>
+            </td>
+          </tr>
+          <tr>
+            <td style="padding:28px;">
+              <p style="margin:0 0 12px;font-size:15px;line-height:1.6;">你好，</p>
+              <p style="margin:0 0 20px;font-size:14px;line-height:1.7;color:#4b5563;">%s</p>
+              %s
+              %s
+            </td>
+          </tr>
+          <tr>
+            <td style="padding:14px 28px;border-top:1px solid #f1f5f9;font-size:12px;color:#9ca3af;text-align:center;">
+              帖子：《%s》<br />
+              <span style="display:inline-block;margin-top:6px;">此邮件由 %s 自动发送，请勿直接回复</span>
+            </td>
+          </tr>
+        </table>
+      </td>
+    </tr>
+  </table>
+</body>
+</html>`,
+		html.EscapeString(subject),
+		preheader,
+		safeSite,
+		safeBody,
+		excerptBlock,
+		linkBlock,
+		safeTitle,
+		safeSite,
+	)
+	return subject, textBody, htmlBody
+}
+
+// BuildModerationMail 生成「待审核」提醒邮件；kindLabel 为「帖子」或「评论」
+// displayFloor 为可见顶层楼号；评论场景 isNested 区分顶层/子回复文案。
+func BuildModerationMail(siteName, kindLabel, authorName, postTitle string, postID uint, displayFloor int, isNested bool, adminLink string) (subject, textBody, htmlBody string) {
+	siteName = strings.TrimSpace(siteName)
+	if siteName == "" {
+		siteName = "姜十三论坛"
+	}
+	kindLabel = strings.TrimSpace(kindLabel)
+	if kindLabel == "" {
+		kindLabel = "内容"
+	}
+	authorName = strings.TrimSpace(authorName)
+	if authorName == "" {
+		authorName = "用户"
+	}
+	postTitle = strings.TrimSpace(postTitle)
+	if postTitle == "" {
+		postTitle = "未知帖子"
+	}
+
+	subject = fmt.Sprintf("【%s】新的待审核%s", siteName, kindLabel)
+
+	var detail string
+	switch {
+	case kindLabel == "评论" && isNested && displayFloor > 0:
+		detail = fmt.Sprintf("用户 %s 在《%s》#%d 楼下提交了待审核回复", authorName, postTitle, displayFloor)
+	case kindLabel == "评论" && displayFloor > 0:
+		detail = fmt.Sprintf("用户 %s 在《%s》提交了待审核 #%d 楼评论", authorName, postTitle, displayFloor)
+	default:
+		detail = fmt.Sprintf("用户 %s 提交了待审核%s《%s》（#%d）", authorName, kindLabel, postTitle, postID)
+	}
+
+	textBody = fmt.Sprintf("你好，\n\n%s。\n请尽快前往管理后台处理。\n", detail)
+	textBody += fmt.Sprintf("\n帖子：《%s》\n", postTitle)
+	if adminLink != "" {
+		textBody += "链接：" + adminLink + "\n"
+	}
+	textBody += fmt.Sprintf("\n— %s\n", siteName)
+
+	safeSite := html.EscapeString(siteName)
+	safeKind := html.EscapeString(kindLabel)
+	safeDetail := html.EscapeString(detail)
+	safeTitle := html.EscapeString(postTitle)
+	safeLink := html.EscapeString(adminLink)
+	preheader := html.EscapeString(fmt.Sprintf("有新的待审核%s需要处理", kindLabel))
+
+	linkBlock := ""
+	if adminLink != "" {
+		linkBlock = fmt.Sprintf(`
+              <p style="margin:0 0 12px;text-align:center;">
+                <a href="%s" style="display:inline-block;padding:10px 18px;background:#18a058;color:#ffffff;text-decoration:none;border-radius:8px;font-size:14px;font-weight:600;">前往审核</a>
+              </p>`, safeLink)
+	}
+
+	htmlBody = fmt.Sprintf(`<!DOCTYPE html>
+<html lang="zh-CN">
+<head>
+<meta charset="UTF-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
+<title>%s</title>
+</head>
+<body style="margin:0;padding:0;background:#f5f7fa;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;color:#1f2937;">
+  <div style="display:none;max-height:0;overflow:hidden;opacity:0;color:transparent;mso-hide:all;">%s</div>
+  <table role="presentation" width="100%%" cellpadding="0" cellspacing="0" style="background:#f5f7fa;padding:28px 12px;">
+    <tr>
+      <td align="center">
+        <table role="presentation" width="100%%" cellpadding="0" cellspacing="0" style="max-width:520px;background:#ffffff;border-radius:12px;border:1px solid #e5e7eb;overflow:hidden;">
+          <tr>
+            <td style="padding:20px 28px;background:linear-gradient(135deg,#18a058,#138f4c);color:#ffffff;">
+              <div style="font-size:18px;font-weight:700;letter-spacing:0.02em;">%s</div>
+              <div style="margin-top:4px;font-size:13px;opacity:0.92;">待审核提醒</div>
+            </td>
+          </tr>
+          <tr>
+            <td style="padding:28px;">
+              <p style="margin:0 0 12px;font-size:15px;line-height:1.6;">你好，</p>
+              <p style="margin:0 0 20px;font-size:14px;line-height:1.7;color:#4b5563;">%s。</p>
+              <p style="margin:0 0 20px;font-size:14px;line-height:1.7;color:#4b5563;">请尽快前往管理后台处理该%s。</p>
+              %s
+            </td>
+          </tr>
+          <tr>
+            <td style="padding:14px 28px;border-top:1px solid #f1f5f9;font-size:12px;color:#9ca3af;text-align:center;">
+              帖子：《%s》<br />
+              <span style="display:inline-block;margin-top:6px;">此邮件由 %s 自动发送，请勿直接回复</span>
+            </td>
+          </tr>
+        </table>
+      </td>
+    </tr>
+  </table>
+</body>
+</html>`,
+		html.EscapeString(subject),
+		preheader,
+		safeSite,
+		safeDetail,
+		safeKind,
+		linkBlock,
+		safeTitle,
+		safeSite,
+	)
+	return subject, textBody, htmlBody
+}

service/notify.go

@@ -0,0 +1,331 @@
+package service
+
+import (
+	"fmt"
+	"strings"
+	"unicode/utf8"
+
+	"git.iioio.com/freefire/jiang13-forum/model"
+)
+
+// NotifyService 站内消息 + 邮件提醒编排
+type NotifyService struct {
+	messages *MessageService
+	mail     *MailService
+	settings *ForumSettingsService
+}
+
+func NewNotifyService(messages *MessageService, mail *MailService, settings *ForumSettingsService) *NotifyService {
+	return &NotifyService{messages: messages, mail: mail, settings: settings}
+}
+
+// 后台执行通知，不阻塞 HTTP 响应；panic 仅记日志
+func (s *NotifyService) goNotify(fn func()) {
+	if s == nil || fn == nil {
+		return
+	}
+	go func() {
+		defer func() {
+			if r := recover(); r != nil {
+				fmt.Printf("notify: 后台任务异常: %v\n", r)
+			}
+		}()
+		fn()
+	}()
+}
+
+// AsyncNotifyCommentPublished 异步：评论公开后通知被回复者或楼主
+func (s *NotifyService) AsyncNotifyCommentPublished(comment *model.Comment) {
+	if s == nil || comment == nil {
+		return
+	}
+	cp := *comment
+	s.goNotify(func() { s.NotifyCommentPublished(&cp) })
+}
+
+// AsyncNotifyPendingPost 异步：待审帖通知管理员
+func (s *NotifyService) AsyncNotifyPendingPost(post *model.Post) {
+	if s == nil || post == nil {
+		return
+	}
+	cp := *post
+	s.goNotify(func() { s.NotifyPendingPost(&cp) })
+}
+
+// AsyncNotifyPendingComment 异步：待审评论通知管理员
+func (s *NotifyService) AsyncNotifyPendingComment(comment *model.Comment) {
+	if s == nil || comment == nil {
+		return
+	}
+	cp := *comment
+	s.goNotify(func() { s.NotifyPendingComment(&cp) })
+}
+
+// NotifyCommentPublished 评论公开后通知被回复者或楼主
+func (s *NotifyService) NotifyCommentPublished(comment *model.Comment) {
+	if s == nil || comment == nil || comment.Status != model.ContentStatusPublished {
+		return
+	}
+
+	post, err := s.loadPost(comment.PostID)
+	if err != nil {
+		return
+	}
+
+	toUserID, err := s.resolveReplyRecipient(comment, post)
+	if err != nil || toUserID == 0 || toUserID == comment.UserID {
+		return
+	}
+
+	authorName := s.commentAuthorName(comment)
+	title := post.Title
+	if title == "" {
+		title = "未知帖子"
+	}
+	displayFloor := s.resolveDisplayFloor(comment)
+	isNested := comment.ReplyTo != nil && *comment.ReplyTo > 0
+	subject := "收到新回复"
+	content := FormatReplyContent(authorName, title, displayFloor, isNested)
+	pid := comment.PostID
+	_, _ = s.messages.SendSystem(toUserID, subject, content, model.MessageKindReply, &pid, nil)
+
+	s.sendReplyMail(toUserID, authorName, title, comment.PostID, displayFloor, isNested, comment.Content)
+}
+
+// NotifyPendingPost 新帖进入待审时通知全部管理员
+func (s *NotifyService) NotifyPendingPost(post *model.Post) {
+	if s == nil || post == nil || post.Status != model.ContentStatusPending {
+		return
+	}
+	title := strings.TrimSpace(post.Title)
+	if title == "" {
+		title = "无标题"
+	}
+	authorName := s.userDisplayName(post.UserID)
+	subject := "新的待审核帖子"
+	content := FormatPendingPostContent(authorName, title, post.ID)
+	pid := post.ID
+	s.notifyAdmins(subject, content, model.MessageKindModeration, &pid, func(siteName, baseURL string) (string, string, string) {
+		return BuildModerationMail(siteName, "帖子", authorName, title, post.ID, 0, false, AbsoluteURL(baseURL, "/admin/posts"))
+	})
+}
+
+// NotifyPendingComment 新评论进入待审时通知全部管理员
+func (s *NotifyService) NotifyPendingComment(comment *model.Comment) {
+	if s == nil || comment == nil || comment.Status != model.ContentStatusPending {
+		return
+	}
+	post, err := s.loadPost(comment.PostID)
+	if err != nil {
+		return
+	}
+	title := strings.TrimSpace(post.Title)
+	if title == "" {
+		title = "未知帖子"
+	}
+	authorName := s.commentAuthorName(comment)
+	subject := "新的待审核评论"
+	displayFloor := s.resolveDisplayFloor(comment)
+	isNested := comment.ReplyTo != nil && *comment.ReplyTo > 0
+	content := FormatPendingCommentContent(authorName, title, displayFloor, isNested)
+	pid := comment.PostID
+	s.notifyAdmins(subject, content, model.MessageKindModeration, &pid, func(siteName, baseURL string) (string, string, string) {
+		return BuildModerationMail(siteName, "评论", authorName, title, comment.PostID, displayFloor, isNested, AbsoluteURL(baseURL, "/admin/comments"))
+	})
+}
+
+func (s *NotifyService) notifyAdmins(
+	subject, content, kind string,
+	relatedPostID *uint,
+	buildMail func(siteName, baseURL string) (subj, text, html string),
+) {
+	admins, err := s.listAdmins()
+	if err != nil || len(admins) == 0 {
+		return
+	}
+
+	seenEmail := make(map[string]struct{})
+	siteName := s.siteName()
+	baseURL := s.settings.SitePublicBaseURL("")
+	mailSubj, mailText, mailHTML := "", "", ""
+	if s.mail != nil && s.settings.MailReady() {
+		mailSubj, mailText, mailHTML = buildMail(siteName, baseURL)
+	}
+
+	for _, admin := range admins {
+		_, _ = s.messages.SendSystem(admin.ID, subject, content, kind, relatedPostID, nil)
+		email := strings.TrimSpace(admin.Email)
+		if email == "" || mailSubj == "" {
+			continue
+		}
+		key := strings.ToLower(email)
+		if _, ok := seenEmail[key]; ok {
+			continue
+		}
+		seenEmail[key] = struct{}{}
+		_ = s.mail.SendHTML(email, mailSubj, mailText, mailHTML)
+	}
+}
+
+func (s *NotifyService) sendReplyMail(toUserID uint, authorName, postTitle string, postID uint, displayFloor int, isNested bool, rawContent string) {
+	if s.mail == nil || !s.settings.MailReady() {
+		return
+	}
+	var user model.User
+	if err := model.DB.Select("id", "email", "nickname", "username").First(&user, toUserID).Error; err != nil {
+		return
+	}
+	email := strings.TrimSpace(user.Email)
+	if email == "" {
+		return
+	}
+	siteName := s.siteName()
+	baseURL := s.settings.SitePublicBaseURL("")
+	postPath := s.settings.Permalink().PostPath(postID)
+	link := AbsoluteURL(baseURL, postPath)
+	excerpt := truncateNotifyExcerpt(rawContent, 120)
+	subj, text, html := BuildReplyMail(siteName, authorName, postTitle, displayFloor, isNested, excerpt, link)
+	_ = s.mail.SendHTML(email, subj, text, html)
+}
+
+func (s *NotifyService) resolveReplyRecipient(comment *model.Comment, post *model.Post) (uint, error) {
+	if comment.ReplyTo != nil && *comment.ReplyTo > 0 {
+		var target model.Comment
+		if err := model.DB.Select("id", "user_id", "post_id").
+			Where("id = ? AND post_id = ?", *comment.ReplyTo, comment.PostID).
+			First(&target).Error; err != nil {
+			return 0, err
+		}
+		if target.UserID > 0 {
+			return target.UserID, nil
+		}
+		// 游客评论无用户账号，回退到楼主
+	}
+	return post.UserID, nil
+}
+
+// resolveDisplayFloor 解析页面可见的顶层楼号（子回复沿 reply_to 上溯）
+func (s *NotifyService) resolveDisplayFloor(comment *model.Comment) int {
+	if comment == nil {
+		return 0
+	}
+	if comment.ReplyTo == nil || *comment.ReplyTo == 0 {
+		return comment.Floor
+	}
+
+	curID := *comment.ReplyTo
+	seen := make(map[uint]struct{}, 8)
+	for i := 0; i < 64; i++ {
+		if _, ok := seen[curID]; ok {
+			break
+		}
+		seen[curID] = struct{}{}
+		var ancestor model.Comment
+		if err := model.DB.Select("id", "floor", "reply_to").
+			Where("id = ? AND post_id = ?", curID, comment.PostID).
+			First(&ancestor).Error; err != nil {
+			return comment.Floor
+		}
+		if ancestor.ReplyTo == nil || *ancestor.ReplyTo == 0 {
+			return ancestor.Floor
+		}
+		curID = *ancestor.ReplyTo
+	}
+	return comment.Floor
+}
+
+func (s *NotifyService) loadPost(postID uint) (*model.Post, error) {
+	var post model.Post
+	if err := model.DB.Select("id", "user_id", "title", "status").First(&post, postID).Error; err != nil {
+		return nil, err
+	}
+	return &post, nil
+}
+
+func (s *NotifyService) listAdmins() ([]model.User, error) {
+	var admins []model.User
+	err := model.DB.Select("id", "email", "nickname", "username").
+		Where("role = ? AND banned = ?", model.RoleAdmin, false).
+		Find(&admins).Error
+	return admins, err
+}
+
+func (s *NotifyService) siteName() string {
+	name := strings.TrimSpace(s.settings.SiteBranding().Name)
+	if name == "" {
+		return "姜十三论坛"
+	}
+	return name
+}
+
+func (s *NotifyService) commentAuthorName(comment *model.Comment) string {
+	if comment.UserID > 0 {
+		if comment.User.ID == comment.UserID {
+			if n := DisplayName(&comment.User); n != "" {
+				return n
+			}
+		}
+		return s.userDisplayName(comment.UserID)
+	}
+	if nick := strings.TrimSpace(comment.GuestNick); nick != "" {
+		return nick
+	}
+	return "游客"
+}
+
+func (s *NotifyService) userDisplayName(userID uint) string {
+	if userID == 0 {
+		return "用户"
+	}
+	var u model.User
+	if err := model.DB.Select("id", "nickname", "username").First(&u, userID).Error; err != nil {
+		return fmt.Sprintf("用户 #%d", userID)
+	}
+	if n := DisplayName(&u); n != "" {
+		return n
+	}
+	return fmt.Sprintf("用户 #%d", userID)
+}
+
+// FormatReplyContent 回复站内私信正文（floor 为可见顶层楼号）
+func FormatReplyContent(authorName, postTitle string, displayFloor int, isNested bool) string {
+	if isNested {
+		return fmt.Sprintf("%s 在《%s》#%d 楼下回复了你。", authorName, postTitle, displayFloor)
+	}
+	return fmt.Sprintf("%s 在《%s》发表了 #%d 楼。", authorName, postTitle, displayFloor)
+}
+
+// FormatPendingPostContent 待审帖站内私信正文
+func FormatPendingPostContent(authorName, postTitle string, postID uint) string {
+	return fmt.Sprintf(
+		"用户 %s 提交了待审核帖子《%s》（#%d），请前往管理后台处理。",
+		authorName, postTitle, postID,
+	)
+}
+
+// FormatPendingCommentContent 待审评论站内私信正文（floor 为可见顶层楼号）
+func FormatPendingCommentContent(authorName, postTitle string, displayFloor int, isNested bool) string {
+	if isNested {
+		return fmt.Sprintf(
+			"用户 %s 在《%s》#%d 楼下提交了待审核回复，请前往管理后台处理。",
+			authorName, postTitle, displayFloor,
+		)
+	}
+	return fmt.Sprintf(
+		"用户 %s 在《%s》提交了待审核 #%d 楼评论，请前往管理后台处理。",
+		authorName, postTitle, displayFloor,
+	)
+}
+
+func truncateNotifyExcerpt(raw string, maxRunes int) string {
+	plain := strings.TrimSpace(StripHTMLForSearch(raw))
+	plain = strings.Join(strings.Fields(plain), " ")
+	if plain == "" {
+		return ""
+	}
+	if maxRunes <= 0 || utf8.RuneCountInString(plain) <= maxRunes {
+		return plain
+	}
+	runes := []rune(plain)
+	return string(runes[:maxRunes]) + "…"
+}

service/seo.go

@@ -32,7 +32,8 @@ func (s *ForumSettingsService) SitePublicBaseURL(requestOrigin string) string {
 	return strings.TrimRight(root, "/")
 }
 
-// AbsoluteURL 将相对路径拼成绝对 URL
+// AbsoluteURL 将相对路径拼成绝对 URL。
+// base 为空或非 http(s) 时返回空串，避免邮件等场景出现无法点击的相对路径。
 func AbsoluteURL(base, pathOrURL string) string {
 	pathOrURL = strings.TrimSpace(pathOrURL)
 	if pathOrURL == "" {
@@ -41,7 +42,10 @@ func AbsoluteURL(base, pathOrURL string) string {
 	if strings.HasPrefix(pathOrURL, "http://") || strings.HasPrefix(pathOrURL, "https://") {
 		return pathOrURL
 	}
-	base = strings.TrimRight(base, "/")
+	base = strings.TrimRight(strings.TrimSpace(base), "/")
+	if base == "" || (!strings.HasPrefix(base, "http://") && !strings.HasPrefix(base, "https://")) {
+		return ""
+	}
 	if !strings.HasPrefix(pathOrURL, "/") {
 		pathOrURL = "/" + pathOrURL
 	}