feat: Implement email verification flow for user registration, update API base URL, and refine agent search screen UI.

lib/features/auth/data/auth_repository.dart

@@ -130,7 +130,9 @@ class AuthRepository {
     }
   }
 
-  Future<UserModel> register(RegisterRequest request) async {
+  /// Register returns { message, user } — no tokens.
+  /// The user must verify their email before logging in.
+  Future<Map<String, dynamic>> register(RegisterRequest request) async {
     try {
       final response = await _dio.post(
         ApiConstants.authRegister,
@@ -138,14 +140,7 @@ class AuthRepository {
       );
 
       final data = response.data['data'] as Map<String, dynamic>;
-      final authResponse = AuthResponse.fromJson(data);
-
-      await SecureStorage.saveTokens(
-        accessToken: authResponse.accessToken,
-        refreshToken: authResponse.refreshToken,
-      );
-
-      return authResponse.user;
+      return data;
     } on DioException catch (e) {
       if (e.error is ApiException) {
         throw e.error as ApiException;