AI助手优化-头像和对话功能

lib/api/auth_api.dart

@@ -39,6 +39,61 @@ class AuthApi {
     }
   }
 
+  /// 拉当前用户资料。冷启动时本地缓存的 userInfo 可能过期（在别处换过头像），
+  /// 用它刷一次。
+  Future<AuthResponse> profile() async {
+    try {
+      final res = await _dio.get('/auth/profile');
+      return AuthResponse.fromJson(_map(res.data));
+    } on DioException catch (e) {
+      throw _unwrap(e);
+    }
+  }
+
+  /// 更新资料。目前只有头像。
+  ///
+  /// [avatar] 传 null = 不改动；[clearAvatar] 传 true = 清空。
+  /// 这两种语义要分清 —— 混淆会让「只改昵称」意外把头像清掉。
+  Future<AuthResponse> updateProfile({String? avatar, bool clearAvatar = false}) async {
+    try {
+      final res = await _dio.put('/auth/profile', data: {
+        'avatar': ?avatar,
+        if (clearAvatar) 'clearAvatar': true,
+      });
+      return AuthResponse.fromJson(_map(res.data));
+    } on DioException catch (e) {
+      throw _unwrap(e);
+    }
+  }
+
+  /// 上传头像，返回**相对路径**（再由 updateProfile 提交）。
+  Future<String> uploadAvatar(String filePath) async {
+    try {
+      final form = FormData.fromMap({
+        'file': await MultipartFile.fromFile(filePath, filename: _fileName(filePath)),
+      });
+      final res = await _dio.post<dynamic>(
+        '/auth/avatar',
+        data: form,
+        options: Options(receiveTimeout: const Duration(seconds: 60)),
+      );
+      final data = res.data;
+      if (data is Map && data['path'] != null) {
+        return data['path'].toString();
+      }
+      throw ApiException(-1, '上传失败：服务端没返回路径');
+    } on DioException catch (e) {
+      throw _unwrap(e);
+    }
+  }
+
+  /// 从路径取文件名，后端靠扩展名判断类型
+  static String _fileName(String path) {
+    final normalized = path.replaceAll('\\', '/');
+    final name = normalized.substring(normalized.lastIndexOf('/') + 1);
+    return name.isEmpty ? 'avatar.jpg' : name;
+  }
+
   Map<String, dynamic> _map(Object? data) {
     if (data is Map<String, dynamic>) return data;
     throw ApiException(-1, '响应格式异常');