Add Telegram notification integration for geofencing

Features:
- Multi-channel notifications (Email + Telegram)
- User-configurable notification settings per channel
- Telegram bot integration with rich messages, location pins, and inline buttons
- QR code generation for easy bot access (@myidbot support)
- Admin UI for notification settings management
- Test functionality for Telegram connection
- Comprehensive documentation

Implementation:
- lib/telegram-service.ts: Telegram API integration
- lib/notification-settings-db.ts: Database layer for user notification preferences
- lib/geofence-notifications.ts: Extended for parallel multi-channel delivery
- API routes for settings management and testing
- Admin UI with QR code display and step-by-step instructions
- Database table: UserNotificationSettings

Documentation:
- docs/telegram.md: Technical implementation guide
- docs/telegram-anleitung.md: User guide with @myidbot instructions
- docs/telegram-setup.md: Admin setup guide
- README.md: Updated NPM scripts section

Docker:
- Updated Dockerfile to copy public directory
- Added TELEGRAM_BOT_TOKEN environment variable
- Integrated notification settings initialization in db:init

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

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

Dockerfile

@@ -36,6 +36,7 @@ RUN npm ci --omit=dev
 # Kopiere Build Artifacts
 COPY --from=builder /app/.next ./.next
 COPY --from=builder /app/data ./data
+COPY --from=builder /app/public ./public
 
 # Kopiere App Code (benötigt für instrumentation.ts, lib/, etc.)
 COPY --from=builder /app/instrumentation.ts ./