feat(huya): 协作台账支持皮肤筛选与主页截图拖拽/粘贴上传

- 外部单列表新增礼包/皮肤精确筛选，并提供去重下拉选项
- 主页截图支持拖拽、多选及 Ctrl/Cmd+V 剪贴板粘贴上传

web/backend/services/huya_collab_service.py

@@ -2019,6 +2019,14 @@ def list_shops(db: Session) -> list[str]:
     return sorted(shop.name for shop in list_shop_records(db))
 
 
+def list_gift_names(db: Session) -> list[str]:
+    """台账里出现过的礼包/皮肤名（去重、去空；筛选下拉用）。"""
+    rows = db.query(HuyaExternalOrder.gift_name).distinct().all()
+    return sorted(
+        {str(row[0]).strip() for row in rows if row[0] and str(row[0]).strip()}
+    )
+
+
 # --------------------------------------------------------------------------
 # CRUD
 # --------------------------------------------------------------------------
@@ -2262,6 +2270,7 @@ def list_orders(
     owner_id: int | None = None,
     status: str = "",
     ck_status: str = "",
+    gift_name: str = "",
     keyword: str = "",
     include_void: bool = False,
     page: int = 1,
@@ -2277,6 +2286,9 @@ def list_orders(
         query = query.filter(HuyaExternalOrder.status == status)
     if ck_status:
         query = query.filter(HuyaExternalOrder.ck_status == ck_status)
+    skin = (gift_name or "").strip()
+    if skin:
+        query = query.filter(HuyaExternalOrder.gift_name == skin)
     if not include_void:
         query = query.filter(HuyaExternalOrder.status != STATUS_VOID)
     text = (keyword or "").strip()