fix: use bot.process_commands() for prefix command dispatch

- Removed manual prefix stripping and bot._commands lookup
- Simply call bot.process_commands(message) in on_message
- This is the standard discord.py way to handle prefix commands
- bot.process_commands() internally: strips prefix → finds command → invokes it
- This separates prefix commands from slash commands completely

main.py

@@ -142,7 +142,6 @@ async def hello_command(ctx: commands.Context, name: str = "World") -> None:
 @bot.command(name="list-commands", description="List all available commands.")
 async def list_commands(ctx: commands.Context) -> None:
     """List all available commands."""
-    # Get all registered commands (both prefix and slash)
     cmds = list(bot.commands.values())
     cmd_list = []
     for cmd in cmds:
@@ -209,36 +208,10 @@ async def on_message(message: discord.Message) -> None:
     if message.guild is None:
         return
 
-    # Check if the message starts with the command prefix (exactly one !)
-    if message.content.startswith("!."):
-        # Strip ONLY the first '!' character
-        content = message.content[1:]
-
-        # Find the matching command by name from the bot's internal command registry
-        command = bot._commands.get(content)
-
-        if command is not None:
-            logger.debug(f"Found command: {command.name}")
-            # Create a minimal context for the command
-            ctx = commands.Context(bot=bot, channel=message.channel, message=message, guild=message.guild)
-            # Call the command directly (bypassing prefix parsing)
-            await command.invoke(ctx)
-        else:
-            logger.debug(f"No command found for: {content}")
-            await message.channel.send("Command not found. Type `!list-commands` for a list of commands.")
-    else:
-        # Message doesn't start with '!', check for normal prefix commands
-        if message.content.startswith("!"):
-            content = message.content[1:]
-            command = bot._commands.get(content)
-
-            if command is not None:
-                logger.debug(f"Found command: {command.name}")
-                ctx = commands.Context(bot=bot, channel=message.channel, message=message, guild=message.guild)
-                await command.invoke(ctx)
-            else:
-                logger.debug(f"No command found for: {content}")
-                await message.channel.send("Command not found. Type `!list-commands` for a list of commands.")
+    # Call bot.process_commands() — this handles PREFIX COMMANDS
+    # It strips the prefix, finds the command, and invokes it.
+    # This is the CORRECT way to handle prefix commands in discord.py.
+    await bot.process_commands(message)
 
 
 @bot.event