统一文件上传方式为直接上传，更新环境变量示例

internal/handler/user_handler.go

@@ -102,44 +102,66 @@ func (h *UserHandler) UpdateProfile(c *gin.Context) {
 	RespondSuccess(c, UserToUserInfo(updatedUser))
 }
 
-// GenerateAvatarUploadURL 生成头像上传URL
-func (h *UserHandler) GenerateAvatarUploadURL(c *gin.Context) {
+// UploadAvatar 直接上传头像文件
+func (h *UserHandler) UploadAvatar(c *gin.Context) {
 	userID, ok := GetUserIDFromContext(c)
 	if !ok {
 		return
 	}
 
-	var req types.GenerateAvatarUploadURLRequest
-	if err := c.ShouldBindJSON(&req); err != nil {
-		RespondBadRequest(c, "请求参数错误", err)
+	// 解析multipart表单
+	if err := c.Request.ParseMultipartForm(10 << 20); err != nil { // 10MB
+		RespondBadRequest(c, "解析表单失败", err)
 		return
 	}
 
-	if h.container.Storage == nil {
-		RespondServerError(c, "存储服务不可用", nil)
-		return
-	}
-
-	result, err := h.container.UploadService.GenerateAvatarUploadURL(c.Request.Context(), userID, req.FileName)
+	// 获取文件
+	file, err := c.FormFile("file")
 	if err != nil {
-		h.logger.Error("生成头像上传URL失败",
+		RespondBadRequest(c, "获取文件失败", err)
+		return
+	}
+
+	// 读取文件内容
+	src, err := file.Open()
+	if err != nil {
+		RespondBadRequest(c, "打开文件失败", err)
+		return
+	}
+	defer src.Close()
+
+	fileData := make([]byte, file.Size)
+	if _, err := src.Read(fileData); err != nil {
+		RespondBadRequest(c, "读取文件失败", err)
+		return
+	}
+
+	// 调用服务上传头像
+	avatarURL, err := h.container.UserService.UploadAvatar(c.Request.Context(), userID, fileData, file.Filename)
+	if err != nil {
+		h.logger.Error("上传头像失败",
 			zap.Int64("user_id", userID),
-			zap.String("file_name", req.FileName),
+			zap.String("file_name", file.Filename),
 			zap.Error(err),
 		)
 		RespondBadRequest(c, err.Error(), nil)
 		return
 	}
 
-	RespondSuccess(c, &types.GenerateAvatarUploadURLResponse{
-		PostURL:   result.PostURL,
-		FormData:  result.FormData,
-		AvatarURL: result.FileURL,
-		ExpiresIn: 900,
+	// 获取更新后的用户信息
+	user, err := h.container.UserService.GetByID(c.Request.Context(), userID)
+	if err != nil || user == nil {
+		RespondNotFound(c, "用户不存在")
+		return
+	}
+
+	RespondSuccess(c, gin.H{
+		"avatar_url": avatarURL,
+		"user":       UserToUserInfo(user),
 	})
 }
 
-// UpdateAvatar 更新头像URL
+// UpdateAvatar 更新头像URL（保留用于外部URL）
 func (h *UserHandler) UpdateAvatar(c *gin.Context) {
 	userID, ok := GetUserIDFromContext(c)
 	if !ok {