Add Firebase cloud sync for household sharing v1.1.0

✨ New Features:
- Firebase Firestore integration for real-time household sharing
- Create household → generates code stored in cloud
- Join household → looks up code from Firebase across devices
- Leave household → updates member list in cloud
- Cloud-first with local Hive fallback for offline

🔧 Technical Implementation:
- Added firebase_core and cloud_firestore dependencies
- Created FirebaseHouseholdService for all cloud operations
- Updated HouseholdScreen to use Firebase for create/join/leave
- Modified gradle files to support Google Services plugin
- Increased minSdk to 21 for Firebase compatibility
- Version bumped to 1.1.0+2 (MAJOR.MINOR.BUGFIX)

📁 New Files:
- lib/features/household/services/firebase_household_service.dart
- FIREBASE_SETUP.md - Complete setup instructions
- android/app/google-services.json - Placeholder (needs replacement)
- android/app/README_FIREBASE.md - Firebase config reminder

⚙️ Setup Required:
1. Create Firebase project at console.firebase.google.com
2. Add Android app with package name: com.sage.sage
3. Download real google-services.json
4. Enable Firestore Database in test mode
5. See FIREBASE_SETUP.md for complete instructions

🎯 How it works:
- Device A creates household → stored in Firestore
- Device B joins with code → reads from Firestore
- Both devices now share same household ID
- Inventory items sync via shared household ID

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

pubspec.yaml

@@ -1,7 +1,7 @@
 name: sage
 description: "Smart Kitchen Management System"
 publish_to: 'none'
-version: 1.0.0+1
+version: 1.1.0+2
 
 environment:
   sdk: ^3.9.2
@@ -26,6 +26,10 @@ dependencies:
   mobile_scanner: ^5.2.3  # Barcode scanning
   http: ^1.2.2  # HTTP requests for Discord webhooks
 
+  # Cloud Backend
+  firebase_core: ^3.8.1  # Firebase initialization
+  cloud_firestore: ^5.6.0  # Firestore database
+
 dev_dependencies:
   flutter_test:
     sdk: flutter