feat: app Flutter GameManager (OIDC pocket-id, contrôle serveurs, MOTD live, auto-update) + CI APK signée

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

lib/main.dart

@@ -0,0 +1,65 @@
+import 'package:flutter/material.dart';
+
+import 'screens/login_screen.dart';
+import 'screens/servers_screen.dart';
+import 'services/api_service.dart';
+import 'services/auth_service.dart';
+import 'theme.dart';
+
+void main() => runApp(const GameManagerApp());
+
+class GameManagerApp extends StatelessWidget {
+  const GameManagerApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    final auth = AuthService();
+    final api = ApiService(auth);
+    return MaterialApp(
+      title: 'GameManager',
+      debugShowCheckedModeBanner: false,
+      theme: AppTheme.light(),
+      darkTheme: AppTheme.dark(),
+      themeMode: ThemeMode.system,
+      home: AuthGate(auth: auth, api: api),
+    );
+  }
+}
+
+/// Aiguille vers la connexion ou la liste des serveurs selon l'état d'auth.
+class AuthGate extends StatefulWidget {
+  const AuthGate({super.key, required this.auth, required this.api});
+  final AuthService auth;
+  final ApiService api;
+
+  @override
+  State<AuthGate> createState() => _AuthGateState();
+}
+
+class _AuthGateState extends State<AuthGate> {
+  bool? _loggedIn;
+
+  @override
+  void initState() {
+    super.initState();
+    widget.auth.isLoggedIn().then((v) => setState(() => _loggedIn = v));
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if (_loggedIn == null) {
+      return const Scaffold(body: Center(child: CircularProgressIndicator()));
+    }
+    if (_loggedIn!) {
+      return ServersScreen(
+        auth: widget.auth,
+        api: widget.api,
+        onLoggedOut: () => setState(() => _loggedIn = false),
+      );
+    }
+    return LoginScreen(
+      auth: widget.auth,
+      onLoggedIn: () => setState(() => _loggedIn = true),
+    );
+  }
+}