Next refactors

lib/main.dart

@@ -4,10 +4,8 @@ import 'package:media_kit/media_kit.dart';
 import 'package:window_manager/window_manager.dart';
 import 'package:trainhub_flutter/core/router/app_router.dart';
 import 'package:trainhub_flutter/core/theme/app_theme.dart';
-import 'package:trainhub_flutter/domain/services/ai_process_manager.dart';
+import 'package:trainhub_flutter/data/services/ai_process_manager.dart';
 import 'package:trainhub_flutter/injection.dart' as di;
-import 'package:trainhub_flutter/presentation/settings/ai_model_settings_controller.dart';
-import 'package:trainhub_flutter/presentation/settings/ai_model_settings_state.dart';
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
@@ -44,14 +42,10 @@ class TrainHubApp extends ConsumerStatefulWidget {
   ConsumerState<TrainHubApp> createState() => _TrainHubAppState();
 }
 
-class _TrainHubAppState extends ConsumerState<TrainHubApp>
-    with WindowListener {
+class _TrainHubAppState extends ConsumerState<TrainHubApp> with WindowListener {
   // Create the router once and reuse it across rebuilds.
   final _appRouter = AppRouter();
 
-  // Guard flag so we never start the servers more than once per app session.
-  bool _serversStarted = false;
-
   // -------------------------------------------------------------------------
   // Lifecycle
   // -------------------------------------------------------------------------
@@ -87,18 +81,6 @@ class _TrainHubAppState extends ConsumerState<TrainHubApp>
 
   @override
   Widget build(BuildContext context) {
-    // Watch the model-settings state and start servers exactly once, the
-    // first time models are confirmed to be present on disk.
-    ref.listen<AiModelSettingsState>(
-      aiModelSettingsControllerProvider,
-      (prev, next) {
-        if (!_serversStarted && next.areModelsValidated) {
-          _serversStarted = true;
-          di.getIt<AiProcessManager>().startServers();
-        }
-      },
-    );
-
     return MaterialApp.router(
       title: 'TrainHub',
       theme: AppTheme.dark,