Stabilizza live YouTube/RTMP e fix crash rotazione mobile.

Pipeline YouTube con relay, overlay e publisher sync lato backend; fix GL pauseGlDuringRotation su Android per evitare crash in rotazione durante lo streaming Flutter.

Co-authored-by: Cursor <cursoragent@cursor.com>

mobile/lib/shared/api_client.dart

@@ -21,8 +21,8 @@ class ApiClient {
     _dio = Dio(
       BaseOptions(
         baseUrl: AppConfig.apiV1,
-        connectTimeout: const Duration(seconds: 15),
-        receiveTimeout: const Duration(seconds: 15),
+        connectTimeout: const Duration(seconds: 30),
+        receiveTimeout: const Duration(seconds: 30),
         headers: {
           'Content-Type': 'application/json',
           'Accept': 'application/json',
@@ -62,12 +62,18 @@ class ApiClient {
     );
   }
 
-  Future<AuthTokens> refresh(String refreshToken) async {
+  Future<({User user, AuthTokens tokens})> refreshSession(
+    String refreshToken,
+  ) async {
     final response = await _dio.post<Map<String, dynamic>>(
       '/auth/refresh',
       data: {'refresh_token': refreshToken},
     );
-    return AuthTokens.fromJson(response.data!);
+    final data = response.data!;
+    return (
+      user: User.fromJson(data['user'] as Map<String, dynamic>),
+      tokens: AuthTokens.fromJson(data),
+    );
   }
 
   Future<User> me() async {