feat: 补全 AuthController 缺失的 @Operation 和 @Parameter 注解

为 8 个缺少 OpenAPI 注解的方法补全中文描述：
getCurrentUserInfo, logout, refreshToken, validateToken,
getUsernameFromToken, checkAccount, checkEmail, checkPhone

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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

@@ -74,6 +74,7 @@ public class AuthController {
      * 获取当前用户信息
      */
     @GetMapping("/userInfo")
+    @Operation(summary = "获取当前用户信息", description = "根据当前登录用户的Token获取用户详细信息")
     public Result<UserInfoResponse> getCurrentUserInfo(HttpServletRequest request) {
         UserInfoResponse userInfo = tokenService.getUserInfoByToken(request);
         return Result.success(userInfo);
@@ -105,6 +106,7 @@ public class AuthController {
      * 用户登出
      */
     @PostMapping("/logout")
+    @Operation(summary = "用户登出", description = "退出登录，清除服务端Token")
     public Result<Void> logout(HttpServletRequest request) {
         authService.logoutByToken(request);
         return Result.success();
@@ -114,6 +116,7 @@ public class AuthController {
      * 刷新访问令牌
      */
     @PostMapping("/refreshToken")
+    @Operation(summary = "刷新访问令牌", description = "使用刷新令牌获取新的访问令牌和刷新令牌")
     public Result<AuthResponse> refreshToken(@Valid @RequestBody RefreshTokenRequest request) {
         AuthResponse response = authService.refreshToken(request.getRefreshToken());
         return Result.success("令牌刷新成功", response);
@@ -123,6 +126,7 @@ public class AuthController {
      * 验证访问令牌
      */
     @GetMapping("/validateToken")
+    @Operation(summary = "验证访问令牌", description = "验证当前Token是否有效")
     public Result<Boolean> validateToken(HttpServletRequest request) {
         boolean isValid = authService.validateToken(request);
         return Result.success(isValid);
@@ -132,6 +136,7 @@ public class AuthController {
      * 获取用户名（通过令牌）
      */
     @GetMapping("/username")
+    @Operation(summary = "获取用户名", description = "根据Token获取当前登录用户的用户名")
     public Result<String> getUsernameFromToken(HttpServletRequest request) {
         String username = tokenService.getUsernameByToken(request);
         return Result.success(username);
@@ -141,7 +146,10 @@ public class AuthController {
      * 检查账号是否存在
      */
     @GetMapping("/checkAccount")
-    public Result<Boolean> checkAccount(@RequestParam String account) {
+    @Operation(summary = "检查账号是否存在", description = "检查指定账号是否已被注册")
+    public Result<Boolean> checkAccount(
+            @Parameter(description = "账号（手机号/邮箱/用户名）", required = true)
+            @RequestParam String account) {
         boolean exists = authService.existsByAccount(account);
         return Result.success(exists);
     }
@@ -150,7 +158,10 @@ public class AuthController {
      * 检查邮箱是否存在
      */
     @GetMapping("/checkEmail")
-    public Result<Boolean> checkEmail(@RequestParam String email) {
+    @Operation(summary = "检查邮箱是否存在", description = "检查指定邮箱是否已被注册")
+    public Result<Boolean> checkEmail(
+            @Parameter(description = "邮箱地址", required = true)
+            @RequestParam String email) {
         boolean exists = authService.existsByEmail(email);
         return Result.success(exists);
     }
@@ -159,7 +170,10 @@ public class AuthController {
      * 检查手机号是否存在
      */
     @GetMapping("/checkPhone")
-    public Result<Boolean> checkPhone(@RequestParam String phone) {
+    @Operation(summary = "检查手机号是否存在", description = "检查指定手机号是否已被注册")
+    public Result<Boolean> checkPhone(
+            @Parameter(description = "手机号码", required = true)
+            @RequestParam String phone) {
         boolean exists = authService.existsByPhone(phone);
         return Result.success(exists);
     }