feat(admin-backend): add user avatar upload endpoint for admins

music-houduan/src/main/java/com/test/musichouduan/controller/UserController.java

@@ -207,6 +207,27 @@ public class UserController {
         return Result.success("更新成功", userDTO);
     }
 
+    /**
+     * 管理员上传指定用户头像
+     *
+     * @param id 用户ID
+     * @param file 头像文件
+     * @return 响应结果
+     */
+    @Operation(summary = "管理员上传用户头像", description = "管理员上传指定用户头像并更新用户信息，需要管理员权限")
+    @SaCheckRole("admin")
+    @PostMapping("/{id}/upload/avatar")
+    public Result<String> adminUploadUserAvatar(
+            @Parameter(description = "用户ID", example = "1") @PathVariable Long id,
+            @Parameter(description = "头像文件") @RequestParam("file") MultipartFile file) {
+        String avatarPhysicalPath = fileService.uploadImage(file);
+        String avatarUrl = avatarPhysicalPath.replace(System.getProperty("user.dir") + File.separator + "music-houduan", "").replace(File.separator, "/");
+
+        userService.adminUpdateUserAvatar(id, avatarUrl);
+
+        return Result.success("上传成功", avatarUrl);
+    }
+
     /**
      * 上传用户头像
      *