Remove USDC product path; CoinOX is coin-margined only.

Drop USDC open/quote/swap APIs and env knobs; retarget hedge/settings copy to USDT/coin.

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

lib/hedge_plan/hedge_plan_register.py

@@ -93,7 +93,11 @@ def _build_cfg(app_module: Any) -> dict[str, Any]:
         "chain_max_dte": float(os.getenv("OKX_OPTIONS_CHAIN_MAX_DTE_DAYS") or os.getenv("OKX_OPTIONS_MAX_DTE_DAYS") or "14"),
         "perp_account_label": (os.getenv("OKX_ACCOUNT_LABEL") or "合约账户").strip(),
         "options_account_label": (os.getenv("OKX_OPTIONS_ACCOUNT_LABEL") or "期权账户").strip(),
-        "trade_budget_usdc": float(os.getenv("OKX_OPTIONS_TRADE_BUDGET_USDC") or "10"),
+        "trade_budget_usdc": float(
+            os.getenv("OKX_OPTIONS_COIN_BUDGET_USDT")
+            or os.getenv("OKX_OPTIONS_TRADE_BUDGET_USDC")
+            or "10"
+        ),
         # 对冲专用缓冲;与期权页 OKX_OPTIONS_BUDGET_BUFFER 独立
         "budget_buffer": float(os.getenv("HEDGE_PLAN_BUDGET_BUFFER") or "0.95"),
         "oo_bias_split_by": _oo_bias_split_by(),
@@ -769,7 +773,7 @@ def register_hedge_plan_routes(app: Flask, cfg: dict[str, Any]) -> None:
                 "chain_max_dte_days": chain_max_dte,
                 "account_kind": "options",
                 "account_label": cfg.get("options_account_label") or "期权账户",
-                "account_note": "期权腿使用期权账户(交易 USDC)",
+                "account_note": "期权腿使用币本位(交易账户 USDT 买币开期权)",
                 "options_account": opt_acct,
                 "trade_budget_usdc": cfg.get("trade_budget_usdc"),
                 "budget_buffer": cfg.get("budget_buffer"),