Show product name, main contract badge, and exchange on position cards.

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

symbols.py

@@ -458,6 +458,39 @@ def _product_for_ths(ths: str) -> Optional[dict]:
     return _THS_TO_PRODUCT.get(key) or _THS_TO_PRODUCT.get(key.lower())
 
 
+def _product_for_contract_code(ths_code: str) -> Optional[dict]:
+    sym = (ths_code or "").strip()
+    if not sym:
+        return None
+    m = re.match(r"^([A-Za-z]+)", sym)
+    if not m:
+        return None
+    return _find_product_by_letters(m.group(1))
+
+
+def position_symbol_meta(ths_code: str) -> dict:
+    """持仓/委托展示：品种名、交易所、是否主力合约。"""
+    sym = (ths_code or "").strip()
+    if not sym:
+        return {"name": "", "exchange": "", "is_main": False}
+    product = _product_for_contract_code(sym)
+    if not product:
+        return {"name": sym, "exchange": "", "is_main": False}
+    codes = ths_to_codes(sym)
+    norm = (codes["ths_code"] if codes else sym).strip().lower()
+    is_main = False
+    with _main_index_lock:
+        main_item = _main_index.get(product["sina"])
+    if main_item:
+        main_ths = (main_item.get("ths_code") or "").strip().lower()
+        is_main = main_ths == norm or main_ths == sym.lower()
+    return {
+        "name": product["name"],
+        "exchange": product.get("exchange") or "",
+        "is_main": is_main,
+    }
+
+
 def _item_from_recommend_row(row: dict, product: dict) -> Optional[dict]:
     """由可开仓缓存行快速构造下拉项（不在 HTTP 请求中解析主力）。"""
     name = row.get("name") or product["name"]