refactor(bot): bot utilities into separate modules

Moved logging, signal handling, and uptime calculation logic from bot.py into dedicated utils modules for better organization and reusability. Updated imports and usage in bot.py and utils/__init__.py accordingly.

utils/signal.py

@@ -0,0 +1,13 @@
+import asyncio
+import signal
+
+
+def setup_signal_handlers(bot):
+    def signal_handler(signum, frame):
+        bot.logger.info("Shutdown requested. Closing bot...")
+        if bot.loop and not bot.loop.is_closed():
+            asyncio.create_task(bot.close())
+            bot.loop.call_soon_threadsafe(bot.loop.stop)
+    
+    signal.signal(signal.SIGINT, signal_handler)
+    signal.signal(signal.SIGTERM, signal_handler)