Initial commit: Fabled Android app

Flutter Android client for FabledAssistant with:
- Session-cookie auth via persistent cookie jar (Dio + cookie_jar)
- OAuth/SSO login via in-app WebView (flutter_inappwebview)
- Notes: list, detail (markdown render), create/edit
- Tasks: list with status tabs, create/edit with priority
- Chat: SSE streaming bubbles, conversation management
- Quick Capture FAB for rapid note/task creation
- Settings screen (change server URL, logout)
- Android home screen widget → opens chat
- Riverpod state management, go_router navigation

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/data/repositories/auth_repository.dart

@@ -0,0 +1,15 @@
+import '../api/auth_api.dart';
+
+class AuthRepository {
+  final AuthApi _api;
+  const AuthRepository(this._api);
+
+  Future<void> login(String username, String password) =>
+      _api.login(username, password);
+
+  Future<void> logout() => _api.logout();
+
+  Future<bool> verify() => _api.verify();
+
+  Future<Map<String, dynamic>> getStatus() => _api.getStatus();
+}