Align margin display with CTP counter rates and position margin.

Read margin ratios from CTP instrument query and margin-rate API instead of vnpy ContractData (which lacks ratios). Keep occupied margin on position UseMargin; use per-lot max rate for recommend table.

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

recommend_store.py

@@ -118,23 +118,19 @@ def _ctp_connected_for_mode(trading_mode: str) -> bool:
 
 
 def recommend_margin_used(trading_mode: str) -> float:
-    """当前持仓已占用保证金（CTP 柜台优先）。"""
+    """当前持仓已占用保证金（各持仓 CTP 回报之和，与柜台持仓保证金一致）。"""
     if not _ctp_connected_for_mode(trading_mode):
         return 0.0
     try:
-        from vnpy_bridge import ctp_account_margin_used, ctp_list_positions
+        from vnpy_bridge import ctp_account_margin_used, ctp_sum_position_margins
 
-        used = ctp_account_margin_used(trading_mode)
-        if used is not None and used > 0:
-            return float(used)
-        total = 0.0
-        for p in ctp_list_positions(
+        total = ctp_sum_position_margins(
             trading_mode, refresh_if_empty=False, refresh_margin=True,
-        ):
-            m = float(p.get("margin") or 0)
-            if m > 0:
-                total += m
-        return round(total, 2) if total > 0 else 0.0
+        )
+        if total > 0:
+            return total
+        used = ctp_account_margin_used(trading_mode)
+        return float(used) if used and used > 0 else 0.0
     except Exception as exc:
         logger.debug("recommend_margin_used: %s", exc)
         return 0.0
@@ -196,6 +192,7 @@ def enrich_recommend_rows(
             margin_one, margin_source, spec_used = margin_one_lot(
                 code_for_margin,
                 price,
+                direction="max",
                 trading_mode=trading_mode if ctp_connected else None,
             )
             if spec_used.get("mult"):