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app/bot/handlers/referral.py

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+"""
+Referral UX (invite links, balances, leaderboards) will register here.
+
+Deep-link attribution on /start is handled by ReferralService + UserService.ensure_user.
+"""
+
+from aiogram import Router
+
+router = Router(name="referral")
+
+# Example (future):
+# @router.message(Command("refer"))
+# async def cmd_refer(...): ...