feat: add bot control script to prevent multiple instances

- Add bot_control.sh script for safe bot management
- Prevent 'Conflict: terminated by other getUpdates' error
- Add Makefile commands: bot-start, bot-stop, bot-restart, bot-status, bot-logs
- Add BOT_MANAGEMENT.md with usage instructions
- Use PID file to track single bot instance
- Auto-stop all old processes before starting
- Add .bot.pid to .gitignore

Fixes issue where multiple bot instances cause command processing failures

Makefile

@@ -68,6 +68,22 @@ run:
 	@echo "🚀 Запуск бота..."
 	. .venv/bin/activate && python main.py
 
+# Управление ботом через скрипт (безопасный запуск одного экземпляра)
+bot-start:
+	@./bot_control.sh start
+
+bot-stop:
+	@./bot_control.sh stop
+
+bot-restart:
+	@./bot_control.sh restart
+
+bot-status:
+	@./bot_control.sh status
+
+bot-logs:
+	@./bot_control.sh logs
+
 # Создание миграции
 migration:
 	@echo "📄 Создание новой миграции..."