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>

scripts/generate-telegram-qr.js

@@ -0,0 +1,40 @@
+#!/usr/bin/env node
+/**
+ * Generate QR Code for Telegram Bot
+ */
+
+const QRCode = require('qrcode');
+const fs = require('fs');
+const path = require('path');
+
+const BOT_URL = 'https://t.me/MeinTracking_bot';
+const OUTPUT_DIR = path.join(process.cwd(), 'public');
+const OUTPUT_FILE = path.join(OUTPUT_DIR, 'telegram-bot-qr.png');
+
+async function generateQR() {
+  try {
+    // Ensure public directory exists
+    if (!fs.existsSync(OUTPUT_DIR)) {
+      fs.mkdirSync(OUTPUT_DIR, { recursive: true });
+    }
+
+    // Generate QR Code
+    await QRCode.toFile(OUTPUT_FILE, BOT_URL, {
+      width: 400,
+      margin: 2,
+      color: {
+        dark: '#000000',
+        light: '#FFFFFF'
+      }
+    });
+
+    console.log(`✅ QR Code generated: ${OUTPUT_FILE}`);
+    console.log(`📱 Bot URL: ${BOT_URL}`);
+    console.log(`🖼️  QR Code size: 400x400px`);
+  } catch (error) {
+    console.error('❌ Error generating QR Code:', error.message);
+    process.exit(1);
+  }
+}
+
+generateQR();