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/init-notification-settings.js

@@ -0,0 +1,38 @@
+#!/usr/bin/env node
+/**
+ * Initialize UserNotificationSettings table
+ */
+
+const Database = require('better-sqlite3');
+const path = require('path');
+
+const dbPath = path.join(process.cwd(), 'data', 'database.sqlite');
+
+try {
+  const db = new Database(dbPath);
+
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS UserNotificationSettings (
+      user_id TEXT PRIMARY KEY,
+      email_enabled INTEGER DEFAULT 1,
+      telegram_enabled INTEGER DEFAULT 0,
+      telegram_chat_id TEXT,
+      created_at TEXT DEFAULT (datetime('now')),
+      updated_at TEXT DEFAULT (datetime('now')),
+
+      FOREIGN KEY (user_id) REFERENCES User(id) ON DELETE CASCADE,
+      CHECK (email_enabled IN (0, 1)),
+      CHECK (telegram_enabled IN (0, 1))
+    );
+
+    CREATE INDEX IF NOT EXISTS idx_user_notification_settings_user
+      ON UserNotificationSettings(user_id);
+  `);
+
+  db.close();
+
+  console.log('✅ Notification settings table initialized!');
+} catch (error) {
+  console.error('❌ Error:', error.message);
+  process.exit(1);
+}