feat: Telegram bot for Instagram monitoring via instaloader

- aiogram 3 bot with commands /start /check /status /stop
- InstagramMonitor: periodic check of followees stories and posts
- Docker deployment with docker-compose
- State tracking to avoid duplicate sends
- Auto-cleanup of old media files

.env.example

@@ -0,0 +1,11 @@
+# Telegram
+TELEGRAM_BOT_TOKEN=your_bot_token_here
+TELEGRAM_CHAT_ID=your_telegram_user_id_here
+
+# Instagram
+INSTAGRAM_USERNAME=your_instagram_username
+INSTAGRAM_PASSWORD=your_instagram_password
+
+# Settings
+CHECK_INTERVAL_MINUTES=15
+MAX_MEDIA_SIZE_MB=50