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>

package.json

@@ -8,10 +8,11 @@
     "build": "next build",
     "start": "next start",
     "lint": "next lint",
-    "db:init": "node scripts/init-database.js && node scripts/init-locations-db.js && node scripts/init-geofence-db.js",
+    "db:init": "node scripts/init-database.js && node scripts/init-locations-db.js && node scripts/init-geofence-db.js && node scripts/init-notification-settings.js",
     "db:init:app": "node scripts/init-database.js",
     "db:init:locations": "node scripts/init-locations-db.js",
     "db:init:geofence": "node scripts/init-geofence-db.js",
+    "db:init:notifications": "node scripts/init-notification-settings.js",
     "db:cleanup": "node scripts/cleanup-old-locations.js",
     "db:cleanup:7d": "node scripts/cleanup-old-locations.js 168",
     "db:cleanup:30d": "node scripts/cleanup-old-locations.js 720",
@@ -21,7 +22,8 @@
     "test:geofence:mqtt": "node scripts/test-mqtt-geofence.js",
     "docs:check": "node scripts/check-docs.js",
     "docs:sync": "node scripts/sync-docs.js",
-    "email:dev": "email dev"
+    "email:dev": "email dev",
+    "telegram:qr": "node scripts/generate-telegram-qr.js"
   },
   "keywords": [],
   "author": "",
@@ -34,6 +36,7 @@
     "@types/node": "^24.10.1",
     "@types/react": "^19.2.4",
     "@types/react-dom": "^19.2.3",
+    "axios": "^1.13.2",
     "bcryptjs": "^3.0.3",
     "better-sqlite3": "^12.4.1",
     "leaflet": "^1.9.4",
@@ -41,6 +44,7 @@
     "next": "^16.0.7",
     "next-auth": "^5.0.0-beta.30",
     "nodemailer": "^7.0.10",
+    "qrcode": "^1.5.4",
     "react": "^19.2.1",
     "react-dom": "^19.2.1",
     "react-email": "^4.3.2",