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>

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();