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_pos/lib/core/router/app_router.dart

@@ -0,0 +1,14 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:go_router/go_router.dart';
+import 'package:meezi_pos/features/auth/login_screen.dart';
+import 'package:meezi_pos/features/pos/pos_screen.dart';
+
+final appRouterProvider = Provider<GoRouter>((ref) {
+  return GoRouter(
+    initialLocation: '/login',
+    routes: [
+      GoRoute(path: '/login', builder: (_, __) => const LoginScreen()),
+      GoRoute(path: '/pos', builder: (_, __) => const PosScreen()),
+    ],
+  );
+});

mobile/meezi_pos/lib/features/auth/login_screen.dart

@@ -0,0 +1,42 @@
+import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
+
+/// Phase 1: online-only OTP login (wire Dio to /api/auth/*).
+class LoginScreen extends StatefulWidget {
+  const LoginScreen({super.key});
+
+  @override
+  State<LoginScreen> createState() => _LoginScreenState();
+}
+
+class _LoginScreenState extends State<LoginScreen> {
+  final _phone = TextEditingController(text: '09121234567');
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: SafeArea(
+        child: Padding(
+          padding: const EdgeInsets.all(24),
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.stretch,
+            children: [
+              const Text('میزی — صندوق', style: TextStyle(fontSize: 22, fontWeight: FontWeight.bold)),
+              const SizedBox(height: 24),
+              TextField(
+                controller: _phone,
+                keyboardType: TextInputType.phone,
+                decoration: const InputDecoration(labelText: 'موبایل', border: OutlineInputBorder()),
+              ),
+              const SizedBox(height: 16),
+              FilledButton(
+                onPressed: () => context.go('/pos'),
+                child: const Text('ورود (دمو)'),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}

mobile/meezi_pos/lib/features/pos/pos_screen.dart

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+import 'package:flutter/material.dart';
+
+/// Phase 1: online POS shell. Phase 2: Drift cart + sync queue + bluetooth_print.
+class PosScreen extends StatelessWidget {
+  const PosScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('صندوق')),
+      body: const Center(
+        child: Text('POS — منو و سبد در فاز بعدی (Drift + API)'),
+      ),
+    );
+  }
+}

mobile/meezi_pos/lib/main.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:meezi_pos/core/router/app_router.dart';
+
+void main() {
+  WidgetsFlutterBinding.ensureInitialized();
+  runApp(const ProviderScope(child: MeeziPosApp()));
+}
+
+class MeeziPosApp extends ConsumerWidget {
+  const MeeziPosApp({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final router = ref.watch(appRouterProvider);
+    return MaterialApp.router(
+      title: 'Meezi POS',
+      theme: ThemeData(
+        colorScheme: ColorScheme.fromSeed(seedColor: const Color(0xFF0F6E56)),
+        useMaterial3: true,
+      ),
+      routerConfig: router,
+    );
+  }
+}