I am building a bilingual (Arabic/English)...

I am building a bilingual (Arabic/English) restaurant reservation mobile app using Flutter 3.22. I need expert guidance on the following four critical technical areas: 1. RTL Layout with flutter_localizations: How do I properly implement RTL text directionality for Arabic in Flutter 3.22? Specifically, how to configure the flutter_localizations package, set up MaterialApp with localizationsDelegates and supportedLocales, and ensure widgets like TextField, ListView, and custom layouts automatically mirror for RTL without breaking LTR English mode? 2. Firebase Cloud Messaging (FCM) Setup: What are the exact steps to configure Firebase for both Android (google-services.json, AndroidManifest permissions, background handlers) and iOS (GoogleService-Info.plist, APNs certificates, Xcode capabilities) in Flutter 3.22? How to handle foreground, background, and terminated state notifications? 3. HyperPay SDK Payment Tokenization: What is the most secure approach to integrate HyperPay SDK in Flutter for online payments? How should I handle payment tokenization to avoid storing raw card data, and what are best practices for PCI-DSS compliance within a Flutter mobile app? 4. Offline-First Architecture with SQLite Sync: What is the recommended architecture for offline-first functionality using a local SQLite database (sqflite package) with background sync to a remote server? How to handle conflict resolution, sync queues, and background isolates in Flutter 3.22?