feat: 品种下拉统一展示推荐列表，与下方品种推荐表一致。

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

symbols.py

@@ -419,6 +419,63 @@ def search_symbols(query: str) -> list:
     return results
 
 
+_THS_TO_PRODUCT = {p["ths"]: p for p in PRODUCTS}
+for _p in PRODUCTS:
+    _THS_TO_PRODUCT.setdefault(_p["ths"].lower(), _p)
+
+
+def _product_for_ths(ths: str) -> Optional[dict]:
+    key = (ths or "").strip()
+    if not key:
+        return None
+    return _THS_TO_PRODUCT.get(key) or _THS_TO_PRODUCT.get(key.lower())
+
+
+def _main_for_product(product: dict) -> Optional[dict]:
+    with _main_index_lock:
+        index = dict(_main_index)
+    main = index.get(product["sina"])
+    if not main:
+        resolved = resolve_main_contract(product)
+        if resolved:
+            main = _enrich_item(resolved)
+    return main
+
+
+def list_recommended_symbols_grouped(recommend_rows: list[dict]) -> list[dict]:
+    """按交易所分类返回推荐品种对应的主力合约（品种选择下拉用）。"""
+    if not recommend_rows:
+        return []
+
+    buckets: dict[str, list] = defaultdict(list)
+    seen: set[str] = set()
+    for row in recommend_rows:
+        if row.get("status") not in ("ok", "margin_ok"):
+            continue
+        ths_key = (row.get("ths") or "").strip()
+        if not ths_key or ths_key in seen:
+            continue
+        product = _product_for_ths(ths_key)
+        if not product:
+            continue
+        seen.add(ths_key)
+        main = _main_for_product(product)
+        if not main:
+            continue
+        item = dict(main)
+        max_lots = row.get("max_lots")
+        if max_lots is not None:
+            item["max_lots"] = max_lots
+        buckets[product["exchange"]].append(_enrich_item(item))
+
+    groups: list[dict] = []
+    for cat in EXCHANGE_ORDER:
+        items = buckets.get(cat)
+        if items:
+            groups.append({"category": cat, "items": items})
+    return groups
+
+
 def list_main_contracts_grouped() -> list[dict]:
     """按交易所分类返回全部品种主力合约（行情页下拉用）。"""
     with _main_index_lock: