服务层重构与优化：补全所有ServiceImpl实现类，修复RestTemplate注入，完善DTO与配置，保证编译与启动通过

backend-single/src/main/java/com/emotion/controller/UserController.java

@@ -5,6 +5,7 @@ import com.emotion.common.BasePageRequest;
 import com.emotion.common.PageResult;
 import com.emotion.common.Result;
 import com.emotion.dto.request.UserCreateRequest;
+import com.emotion.dto.request.UserUpdateRequest;
 import com.emotion.dto.response.UserResponse;
 import com.emotion.entity.User;
 import com.emotion.service.UserService;
@@ -13,6 +14,7 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.*;
 
+import javax.validation.Valid;
 import java.time.format.DateTimeFormatter;
 import java.util.List;
 import java.util.stream.Collectors;
@@ -68,7 +70,7 @@ public class UserController {
      * 创建用户
      */
     @PostMapping
-    public Result<UserResponse> create(@Validated @RequestBody UserCreateRequest request) {
+    public Result<UserResponse> create(@Valid @RequestBody UserCreateRequest request) {
         User user = userService.createUser(
                 request.getAccount(),
                 request.getUsername(),
@@ -83,12 +85,16 @@ public class UserController {
      * 更新用户
      */
     @PutMapping("/{id}")
-    public Result<UserResponse> update(@PathVariable String id, @RequestBody User user) {
+    public Result<UserResponse> update(@PathVariable String id, @Valid @RequestBody UserUpdateRequest request) {
+        User user = new User();
+        BeanUtils.copyProperties(request, user);
         user.setId(id);
+
         boolean updated = userService.updateById(user);
         if (!updated) {
             return Result.error("更新失败");
         }
+
         User updatedUser = userService.getById(id);
         return Result.success(convertToResponse(updatedUser));
     }