chore: update .env.example and logger.js for improved configuration and logging level management

.env.example

@@ -1,4 +1,17 @@
+# Discord Bot Token
 DISCORD_TOKEN=your_token_here
-LAVALINK_HOST=127.0.0.1
+
+# Discord Application Client ID (for command deployment)
+CLIENT_ID=your_client_id_here
+
+# Discord Guild ID (optional, for deploying commands to a specific test server)
+# GUILD_ID=your_guild_id_here
+
+# Lavalink Configuration
+# Use 'lavalink' if running via docker-compose, '127.0.0.1' or 'localhost' if running Lavalink directly
+LAVALINK_HOST=lavalink
 LAVALINK_PORT=2333
 LAVALINK_PASSWORD=your_password_here
+
+# Logging Level (e.g., debug, info, warn, error)
+LOG_LEVEL=info