完善下单表单与 CTP 持仓，requirements 加入 vnpy 并更新部署文档

以损定仓/固定张数分栏下单、限价市价、持仓仅读柜台；DEPLOY 补充 SimNow 与 vnpy 安装说明。

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

vnpy_bridge.py

@@ -173,12 +173,16 @@ class CtpBridge:
             elif direction is not None and "空" in str(direction):
                 d = "short"
             sym = getattr(pos, "symbol", "") or ""
+            exchange = getattr(pos, "exchange", None)
+            ex_name = str(exchange.value if hasattr(exchange, "value") else exchange or "")
             out.append({
                 "symbol": sym,
+                "exchange": ex_name,
                 "direction": d,
                 "lots": vol,
                 "avg_price": float(getattr(pos, "price", 0) or 0),
                 "pnl": float(getattr(pos, "pnl", 0) or 0),
+                "frozen": int(getattr(pos, "frozen", 0) or 0),
             })
         return out
 
@@ -190,6 +194,7 @@ class CtpBridge:
         direction: str,
         lots: int,
         price: float,
+        order_type: str = "limit",
     ) -> str:
         from vnpy.trader.constant import Direction, Offset, OrderType
         from vnpy.trader.object import OrderRequest
@@ -217,11 +222,13 @@ class CtpBridge:
         else:
             raise ValueError(f"未知开平: {offset}")
 
+        ot = OrderType.MARKET if (order_type or "limit").lower() == "market" else OrderType.LIMIT
+
         req = OrderRequest(
             symbol=sym,
             exchange=exchange,
             direction=d,
-            type=OrderType.LIMIT,
+            type=ot,
             volume=lots,
             price=price,
             offset=off,
@@ -290,6 +297,7 @@ def execute_order(
     lots: int,
     price: float,
     settings: dict | None = None,
+    order_type: str = "limit",
 ) -> dict[str, Any]:
     """统一下单：simulation=SimNow，live=期货公司 CTP。"""
     del conn, settings
@@ -308,6 +316,7 @@ def execute_order(
         direction=direction,
         lots=lots,
         price=price,
+        order_type=order_type,
     )
     return {
         "order_id": order_id,