Phase 2 of multi-environment setup. Adds Firebase core, Crashlytics,
Analytics, Remote Config, Performance, Messaging and flutter_local_notifications,
plus full APNs configuration for iOS push.
- Wire setupFirebase(env) and setupNotifications() in initApp
- Add firebase_options for dev and staging via flutterfire (sf-platform-pre)
- Register google-services / firebase-perf / crashlytics gradle plugins
- Add per-flavor GoogleService-Info.plist with Build Phase script that
copies the right plist into the .app bundle based on \$CONFIGURATION
- Bump iOS deployment target 13.0 -> 15.0 (required by firebase_analytics)
- Pin flutter_local_notifications to ^19.4.2 (v20+ needs Dart SDK >=3.10)
- Add aps-environment to staging (development) and production entitlements;
development flavor intentionally excluded (no App Store Connect entry)
- Fix AppDelegate.swift to call super.application after forwarding to
AntelopAppDelegate, otherwise Firebase Messaging swizzling breaks and
the APNs token is never captured
- Crashlytics reports in all builds (debug + release) for early detection
- Tag analytics events with env user property per flavor
- App Check intentionally not included (debug-token friction with large
QA team); can be re-added release-only later
