Add cxyz Android project structure and initial configuration

- Introduced a new Flutter project for the cxyz Android manga/comic reader, including essential files such as pubspec.yaml, AndroidManifest.xml, and Gradle configuration.
- Added .gitignore files to exclude unnecessary files and directories for both the main project and Android-specific files.
- Implemented initial README.md with project description, features, setup instructions, and API details for ComicLand, MangaRead, and MangaTown.
- Configured analysis options and dependencies in pubspec.yaml to support Flutter development.
- Established a pnpm workspace and lockfile for dependency management.
- Included various Android resources such as icons, styles, and launch backgrounds for a complete application setup.

cxyz-android/lib/main.dart

@@ -0,0 +1,62 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import 'providers/providers.dart';
+import 'router.dart';
+
+void main() {
+  WidgetsFlutterBinding.ensureInitialized();
+  runApp(const ProviderScope(child: CxyzApp()));
+}
+
+class CxyzApp extends ConsumerStatefulWidget {
+  const CxyzApp({super.key});
+
+  @override
+  ConsumerState<CxyzApp> createState() => _CxyzAppState();
+}
+
+class _CxyzAppState extends ConsumerState<CxyzApp> with WidgetsBindingObserver {
+  @override
+  void initState() {
+    super.initState();
+    WidgetsBinding.instance.addObserver(this);
+  }
+
+  @override
+  void dispose() {
+    WidgetsBinding.instance.removeObserver(this);
+    super.dispose();
+  }
+
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    if (state == AppLifecycleState.resumed) {
+      ref.read(webDavSyncProvider).scheduleSync();
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final router = ref.watch(routerProvider);
+    return MaterialApp.router(
+      title: 'cxyz',
+      debugShowCheckedModeBanner: false,
+      theme: ThemeData(
+        colorScheme: ColorScheme.fromSeed(
+          seedColor: const Color(0xFF1B6CA8),
+          brightness: Brightness.light,
+        ),
+        useMaterial3: true,
+      ),
+      darkTheme: ThemeData(
+        colorScheme: ColorScheme.fromSeed(
+          seedColor: const Color(0xFF1B6CA8),
+          brightness: Brightness.dark,
+        ),
+        useMaterial3: true,
+      ),
+      routerConfig: router,
+    );
+  }
+}