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/sim/ledger.py

@@ -50,7 +50,15 @@ class Ledger:
                 (group_id, kind, float(amount), equity, note, now),
             )
             self.db._conn.commit()
-            return equity
+        try:
+            from ..config import get_settings
+            from .funds_wallets import SimFundsWallets
+
+            if get_settings().is_sim:
+                SimFundsWallets(self.db).mirror_cash(float(amount), kind=kind)
+        except Exception:
+            pass
+        return equity
 
     def reset_equity(self, amount: float, *, note: str = "重置模拟资金") -> float:
         """将权益与可用资金重置为 amount（reserved 清零）。须在无持仓时调用。"""
@@ -68,7 +76,15 @@ class Ledger:
                 (None, "reset", amt, amt, note, now),
             )
             self.db._conn.commit()
-            return amt
+        try:
+            from ..config import get_settings
+            from .funds_wallets import SimFundsWallets
+
+            if get_settings().is_sim:
+                SimFundsWallets(self.db).reset_from_equity(amt)
+        except Exception:
+            pass
+        return amt
 
     def get_setting_float(self, key: str, default: float) -> float:
         v = self.db.get_setting(key)