feat(02-01): create handlers package with register_handlers

- register_handlers function takes Application
- Empty placeholder for handler registration
- Ready for 02-02 to add actual handlers

src/moai/bot/handlers/__init__.py

@@ -1,5 +1,19 @@
-"""Telegram command handlers.
+"""Telegram command handlers for MoAI bot.
 
 This module contains handlers for Telegram bot commands including
 project management, discussion commands, and export functionality.
 """
+
+from telegram.ext import Application
+
+
+def register_handlers(app: Application) -> None:
+    """Register all command handlers with the application.
+
+    Args:
+        app: The telegram Application instance.
+    """
+    # Handlers will be imported and registered here as they're implemented:
+    # from moai.bot.handlers import commands
+    # app.add_handler(CommandHandler("help", commands.help_command))
+    pass