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/AuthController.java

@@ -3,16 +3,17 @@ package com.emotion.controller;
 import com.emotion.common.Result;
 import com.emotion.dto.request.LoginRequest;
 import com.emotion.dto.request.RegisterRequest;
+import com.emotion.dto.request.RefreshTokenRequest;
 import com.emotion.dto.response.AuthResponse;
 import com.emotion.dto.response.CaptchaResponse;
 import com.emotion.dto.response.UserInfoResponse;
 import com.emotion.service.AuthService;
 import com.emotion.service.TokenService;
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.*;
 
 import javax.servlet.http.HttpServletRequest;
+import javax.validation.Valid;
 
 /**
  * 认证控制器
@@ -34,7 +35,7 @@ public class AuthController {
      * 用户登录
      */
     @PostMapping("/login")
-    public Result<AuthResponse> login(@RequestBody @Validated LoginRequest request) {
+    public Result<AuthResponse> login(@Valid @RequestBody LoginRequest request) {
         AuthResponse response = authService.login(request);
         return Result.success("登录成功", response);
     }
@@ -43,7 +44,7 @@ public class AuthController {
      * 用户注册
      */
     @PostMapping("/register")
-    public Result<AuthResponse> register(@RequestBody @Validated RegisterRequest request) {
+    public Result<AuthResponse> register(@Valid @RequestBody RegisterRequest request) {
         AuthResponse response = authService.register(request);
         return Result.success("注册成功", response);
     }
@@ -81,8 +82,8 @@ public class AuthController {
      * 刷新访问令牌
      */
     @PostMapping("/refresh")
-    public Result<AuthResponse> refreshToken(@RequestParam String refreshToken) {
-        AuthResponse response = authService.refreshToken(refreshToken);
+    public Result<AuthResponse> refreshToken(@Valid @RequestBody RefreshTokenRequest request) {
+        AuthResponse response = authService.refreshToken(request.getRefreshToken());
         return Result.success("令牌刷新成功", response);
     }