Create school weekly routine

### ✨ New Features
- Complete student enrollment and management system
- Multi-batch support with section and group organization
- Comprehensive fee collection and payment tracking
- Automated receipt generation with PDF export
- Real-time dashboard with financial analytics
- Teacher and subject assignment management
- Weekly routine generation efortlessly
- Attendance tracking system
- Session-based academic year management

### 🔒 Security & Performance
- Enhanced Firebase security rules for data protection
- Optimized offline-first architecture with SQLite
- Improved app stability and performance
- Production-ready security configurations

### 📱 User Experience
- Clean, intuitive Material Design interface
- Dark mode support for comfortable viewing
- Fast and responsive UI
- Seamless online/offline synchronization

### 🐛 Bug Fixes
- Fixed session management data persistence
- Improved payment calculation accuracy
- Enhanced image upload reliability
- Resolved synchronization edge cases

---

## Known Issues
None reported in this release.

## Upgrade Notes
This is the first production release. No migration required.

## Minimum Requirements
- Android 5.0 (API 21) or higher
- 100 MB free storage space
- Internet connection for cloud sync (optional for offline use)