Add Telegram bot integration for real-time alert notifications

- Implemented ITelegramNotificationService and TelegramNotificationService for sending alerts via Telegram.
- Updated MonitoringSettings to include Telegram configuration options.
- Enhanced AlertService to send alerts and resolutions through Telegram.
- Added API endpoints for checking Telegram status and sending test alerts.
- Updated README and TELEGRAM_SETUP.md with setup instructions and features.
- Included example configuration in appsettings.telegram.example.json.

README.md

@@ -22,6 +22,7 @@ A comprehensive system monitoring service specifically designed for Windows VMs
 - **Game Detection**: Multi-platform game detection with fullscreen monitoring and configurable root folders
 - **Process Management**: View top processes with CPU/memory percentages, terminate processes via API
 - **Smart Alerting**: Duration-based alerting to prevent false positives
+- **Telegram Bot Integration**: Real-time alerts via Telegram bot with customizable notifications
 - **System Control**: Remote shutdown/restart capabilities
 - **Health Monitoring**: Comprehensive health checks and uptime tracking
 - **Real-time Metrics**: CPU usage calculation and memory percentage tracking for processes
@@ -57,6 +58,10 @@ The service runs on `http://localhost:5000` by default and provides the followin
 - `POST /api/alerts/{alertId}/resolve` - Manually resolve an alert
 - `GET /api/alerts/enabled` - Check if alerting is enabled
 
+### Telegram Bot Integration
+- `GET /api/telegram/status` - Check Telegram bot status and connection
+- `POST /api/telegram/test` - Send a test alert to verify bot configuration
+
 ### System Control
 - `POST /api/process/kill` - Terminate a process (requires process ID and optional force flag)
 - `POST /api/system/shutdown` - Shutdown, restart, or cancel system operations
@@ -180,6 +185,40 @@ D:\Games\The Witcher 3\witcher3.exe
 - Use absolute paths (e.g., `C:\Games`, not `Games`)
 - Root folders are checked in order, so prioritize most common locations first
 
+### Telegram Bot Alerts
+
+The service supports real-time alert notifications via Telegram bot. To set up Telegram alerts:
+
+1. **Create a Telegram Bot** - Contact `@BotFather` on Telegram and create a new bot
+2. **Get Chat ID** - Send a message to your bot, then visit `https://api.telegram.org/bot<TOKEN>/getUpdates`
+3. **Configure Settings** - Add Telegram configuration to your `appsettings.json`:
+
+```json
+{
+  "MonitoringSettings": {
+    "Telegram": {
+      "IsEnabled": true,
+      "BotToken": "123456789:ABCdefGHIjklMNOpqrSTUvwxyz",
+      "ChatIds": [123456789, -987654321],
+      "SendWarningAlerts": true,
+      "SendCriticalAlerts": true,
+      "SendResolutionNotifications": true,
+      "MessageTemplate": "🚨 *{Level} Alert*\n\n📊 *{Component}*\n💬 {Message}\n⏰ {Timestamp}",
+      "ResolutionTemplate": "✅ *Alert Resolved*\n\n📊 *{Component}*\n💬 {Message}\n⏰ Resolved at {ResolvedAt}"
+    }
+  }
+}
+```
+
+**Features:**
+- **Multiple Chats**: Send alerts to multiple users/groups by adding chat IDs
+- **Customizable Templates**: Modify message format with placeholders for alert data
+- **Alert Filtering**: Choose which alert levels to send (Warning/Critical)
+- **Silent Notifications**: Warning alerts are sent silently, critical alerts with sound
+- **Resolution Notifications**: Optional notifications when alerts are resolved
+
+📋 For detailed setup instructions, see [TELEGRAM_SETUP.md](TELEGRAM_SETUP.md)
+
 ## 📊 Example API Responses
 
 ### Health Check