feat: 实现用户头像上传功能

- 创建头像上传API接口 (POST /api/v1/users/:id/avatar)
- 实现完整的头像上传逻辑，包含权限验证和文件处理
- 添加头像图片处理功能，支持自动压缩和居中裁剪
- 完善静态文件服务，支持头像访问
- 创建完整的API测试用例
- 更新任务进度文档

任务11已完成，项目完成率提升至37.5%

backend/internal/handler/routes.go

@@ -17,11 +17,6 @@ import (
 )
 
 func RegisterHandlers(server *rest.Server, serverCtx *svc.ServiceContext) {
-	server.AddRoutes(
-		[]rest.Route{},
-		rest.WithJwt(serverCtx.Config.Auth.AccessSecret),
-	)
-
 	server.AddRoutes(
 		[]rest.Route{
 			{
@@ -158,6 +153,12 @@ func RegisterHandlers(server *rest.Server, serverCtx *svc.ServiceContext) {
 				Path:    "/:id",
 				Handler: user.DeleteUserHandler(serverCtx),
 			},
+			{
+				// 上传用户头像
+				Method:  http.MethodPost,
+				Path:    "/:id/avatar",
+				Handler: user.UploadAvatarHandler(serverCtx),
+			},
 		},
 		rest.WithJwt(serverCtx.Config.Auth.AccessSecret),
 		rest.WithPrefix("/api/v1/users"),

backend/internal/handler/user/uploadavatarhandler.go

@@ -0,0 +1,29 @@
+package user
+
+import (
+	"net/http"
+
+	"github.com/zeromicro/go-zero/rest/httpx"
+	"photography-backend/internal/logic/user"
+	"photography-backend/internal/svc"
+	"photography-backend/internal/types"
+)
+
+// 上传用户头像
+func UploadAvatarHandler(svcCtx *svc.ServiceContext) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		var req types.UploadAvatarRequest
+		if err := httpx.Parse(r, &req); err != nil {
+			httpx.ErrorCtx(r.Context(), w, err)
+			return
+		}
+
+		l := user.NewUploadAvatarLogic(r.Context(), svcCtx)
+		resp, err := l.UploadAvatar(&req, r)
+		if err != nil {
+			httpx.ErrorCtx(r.Context(), w, err)
+		} else {
+			httpx.OkJsonCtx(r.Context(), w, resp)
+		}
+	}
+}