chore: Flutter mobile app, CI, and dev tooling

- mobile/: Flutter/Dart merchant mobile app skeleton
- .github/: GitHub Actions CI workflows
- .dockerignore: exclude host node_modules from build context
- .cursorrules: Cursor IDE project rules
- .claude/: Claude Code project settings and launch config

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

mobile/meezi_app/lib/main.dart

@@ -0,0 +1,32 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import 'app/router.dart';
+
+void main() {
+  runApp(const ProviderScope(child: MeeziApp()));
+}
+
+class MeeziApp extends StatelessWidget {
+  const MeeziApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp.router(
+      title: 'میزی',
+      locale: const Locale('fa'),
+      supportedLocales: const [Locale('fa'), Locale('ar'), Locale('en')],
+      localizationsDelegates: const [
+        GlobalMaterialLocalizations.delegate,
+        GlobalWidgetsLocalizations.delegate,
+        GlobalCupertinoLocalizations.delegate,
+      ],
+      theme: ThemeData(
+        colorScheme: ColorScheme.fromSeed(seedColor: const Color(0xFF6B4F3A)),
+        useMaterial3: true,
+      ),
+      routerConfig: appRouter,
+    );
+  }
+}