Refactor metrics handling and remove scheduler

- Removed the metrics scheduler functionality from the bot, transitioning to real-time metrics updates via middleware.
- Enhanced logging for metrics operations across various handlers to improve monitoring and debugging capabilities.
- Integrated metrics tracking for user activities and database errors, providing better insights into bot performance.
- Cleaned up code by removing obsolete comments and unused imports, improving overall readability and maintainability.

helper_bot/main.py

@@ -81,12 +81,8 @@ async def start_bot(bdf):
         # Запускаем метрики сервер
         await start_metrics_server(metrics_host, metrics_port)
         
-        # Запускаем планировщик метрик для периодического обновления
-        from .utils.metrics_scheduler import start_metrics_scheduler
-        await start_metrics_scheduler()
-        
         logging.info(f"✅ Метрики сервер запущен на {metrics_host}:{metrics_port}")
-        logging.info("✅ Планировщик метрик запущен")
+        logging.info("✅ Метрики будут обновляться в реальном времени через middleware")
         
         # Запускаем бота с retry логикой
         await start_bot_with_retry(bot, dp)