移除旧版 HTML 模板与兼容层，并完善私信、举报、媒体存储与 SEO。

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

service/upload.go

@@ -1,14 +1,7 @@
 package service
 
 import (
-	"errors"
-	"fmt"
-	"io"
 	"mime/multipart"
-	"os"
-	"path/filepath"
-	"strings"
-	"time"
 )
 
 var allowedImageExt = map[string]bool{
@@ -19,44 +12,7 @@ var allowedImageExt = map[string]bool{
 	".webp": true,
 }
 
-// SaveUploadedImage 保存图片到本地目录，返回公开 URL 路径
-func SaveUploadedImage(file *multipart.FileHeader, dir, urlPrefix, namePrefix string) (string, error) {
-	ext := strings.ToLower(filepath.Ext(file.Filename))
-	if !allowedImageExt[ext] {
-		return "", errors.New("仅支持 jpg/png/gif/webp 格式")
-	}
-	if err := os.MkdirAll(dir, 0755); err != nil {
-		return "", err
-	}
-
-	filename := fmt.Sprintf("%s_%d%s", namePrefix, time.Now().UnixNano(), ext)
-	destPath := filepath.Join(dir, filename)
-
-	src, err := file.Open()
-	if err != nil {
-		return "", err
-	}
-	defer src.Close()
-
-	dst, err := os.Create(destPath)
-	if err != nil {
-		return "", err
-	}
-	defer dst.Close()
-
-	if _, err := io.Copy(dst, src); err != nil {
-		return "", err
-	}
-
-	prefix := strings.TrimSuffix(urlPrefix, "/")
-	url := prefix + "/" + filename
-
-	// 帖子正文图：后台预热缩略图，加速首次打开详情
-	if strings.Contains(prefix, "/posts") {
-		uploadsRoot := filepath.Dir(dir) // .../uploads/posts → .../uploads
-		rel := filepath.ToSlash(filepath.Join(filepath.Base(dir), filename))
-		go WarmPostImageThumb(uploadsRoot, rel)
-	}
-
-	return url, nil
+// SaveUploadedImage 保存图片到当前存储后端，返回公开 URL
+func SaveUploadedImage(store *UploadStore, file *multipart.FileHeader, category, namePrefix string) (string, error) {
+	return store.SaveImage(file, category, namePrefix)
 }