Phase 2 refinements: Firebase config, dev environment fixes, phase 3 requirement draft

- Integrated Firebase SDK in both Flutter apps (google-services, firebase_options)
- Fixed auth flow, API client, and pairing/status blocs for dev environment
- Added full Flutter project scaffolds (android, ios, web, etc.)
- Added phase 3 chat engine requirement document
- Added bugreport zip pattern to gitignore

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

client_app/lib/main.dart

@@ -1,6 +1,7 @@
 import 'package:firebase_core/firebase_core.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:go_router/go_router.dart';
 import 'core/api/api_client.dart';
 import 'core/auth/auth_bloc.dart';
 import 'core/pairing/pairing_bloc.dart';
@@ -13,25 +14,43 @@ void main() async {
   runApp(const App());
 }
 
-class App extends StatelessWidget {
+class App extends StatefulWidget {
   const App({super.key});
 
+  @override
+  State<App> createState() => _AppState();
+}
+
+class _AppState extends State<App> {
+  final _apiClient = ApiClient();
+  late final AuthBloc _authBloc;
+  late final GoRouter _router;
+
+  @override
+  void initState() {
+    super.initState();
+    _authBloc = AuthBloc(apiClient: _apiClient)..add(AppStarted());
+    _router = buildRouter(_authBloc);
+  }
+
+  @override
+  void dispose() {
+    _authBloc.close();
+    _router.dispose();
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
-    final apiClient = ApiClient();
     return MultiBlocProvider(
       providers: [
-        BlocProvider(create: (_) => AuthBloc(apiClient: apiClient)..add(AppStarted())),
-        BlocProvider(create: (_) => PairingBloc(apiClient: apiClient)),
-        RepositoryProvider.value(value: apiClient),
+        BlocProvider.value(value: _authBloc),
+        BlocProvider(create: (_) => PairingBloc(apiClient: _apiClient)),
+        RepositoryProvider.value(value: _apiClient),
       ],
-      child: BlocBuilder<AuthBloc, AuthState>(
-        builder: (context, state) {
-          return MaterialApp.router(
-            title: 'Halo Bestie',
-            routerConfig: buildRouter(context.read<AuthBloc>()),
-          );
-        },
+      child: MaterialApp.router(
+        title: 'Halo Bestie',
+        routerConfig: _router,
       ),
     );
   }