feat(economy): creator payout request models, migration, and API

backend/app/main.py

@@ -9,7 +9,7 @@ from app.config import settings
 from app.routers import (
     auth, users, worlds, assets, avatar, world_content, internal,
     presence, groups, social_friends, profiles, chat_dm, chat_reports,
-    chat_world, wallet, payments, marketplace,
+    chat_world, wallet, payments, marketplace, payouts,
 )
 from app.gateway import ws
 
@@ -61,6 +61,7 @@ app.include_router(chat_world.router, prefix="/v1/chat", tags=["chat-world"])
 app.include_router(wallet.router, prefix="/api/wallet", tags=["wallet"])
 app.include_router(payments.router, prefix="/api/payments", tags=["payments"])
 app.include_router(marketplace.router, prefix="/api/marketplace", tags=["marketplace"])
+app.include_router(payouts.router, prefix="/api/payouts", tags=["payouts"])
 app.include_router(ws.router, prefix="/api", tags=["websocket"])
 app.include_router(ws.router, prefix="/v1", tags=["websocket"])