Add OKX-style funds bar with USDT/USDC convert and transfer.

SIM uses multi-wallet balances; LIVE hits OKX asset/account APIs and spot USDC-USDT swap. Funds strip hides sim labeling.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/api/__init__.py

@@ -2,6 +2,7 @@ from fastapi import APIRouter
 
 from .auth_routes import router as auth_router
 from .backup_routes import router as backup_router
+from .funds import router as funds_router
 from .market import router as market_router
 from .plan import router as plan_router
 from .settings import router as settings_router
@@ -16,5 +17,6 @@ router.include_router(sim_router)
 router.include_router(plan_router)
 router.include_router(trades_router)
 router.include_router(stats_router)
+router.include_router(funds_router)
 router.include_router(settings_router)
 router.include_router(backup_router)