fix: rename !help to !list-commands to avoid collision with built-in help

- discord.ext.commands provides a built-in 'help' command
- Renamed the custom command from 'help' to 'list-commands'
- Now users can type !list-commands to see all available commands

main.py

@@ -139,7 +139,7 @@ async def hello_command(ctx: commands.Context, name: str = "World") -> None:
     """Say hello to someone."""
     await ctx.send(f"Hello, {name}!")
 
-@bot.command(name="help", description="List all available commands.")
+@bot.command(name="list-commands", description="List all available commands.")
 async def help_command(ctx: commands.Context) -> None:
     """List all available commands."""
     # Get all registered commands (both prefix and slash)