fix: align research metadata with live WorldQuant responses

backend/app/catalog/research_metadata.py

@@ -70,8 +70,16 @@ def setting_rows(data):
         raise HTTPException(502, "平台设置结构无法识别，未发布新快照") from None
 
 
-def normalize_availability(data):
+def normalize_availability(data, *, instrument_type=None):
+    """Use the request's instrument only for the platform field-detail `data` form.
+
+    Legacy availability rows must still state their own instrument. Missing market,
+    delay or universe never inherits the requested scope.
+    """
     raw = data.get("availability")
+    detail_form = raw is None and isinstance(data.get("data"), list)
+    if detail_form:
+        raw = data["data"]
     if not isinstance(raw, list):
         return {"status": "needs_review", "items": [], "reason": "平台未提供可识别的 availability 列表"}
     rows, malformed = [], False
@@ -83,7 +91,7 @@ def normalize_availability(data):
         universes = universes if isinstance(universes, list) else [universes]
         for universe in universes:
             if (
-                item.get("instrumentType") == "EQUITY"
+                item.get("instrumentType", instrument_type if detail_form else None) == "EQUITY"
                 and type(item.get("delay")) is int
                 and item["delay"] in (0, 1)
                 and isinstance(item.get("region"), str)
@@ -227,8 +235,10 @@ class ResearchMetadata:
 
     async def refresh_availability(self, body):
         data = await upstream(self.client.field_availability(body.field_id, body.scope))
+        if data.get("id") is not None and data["id"] != body.field_id:
+            raise HTTPException(502, "平台返回字段与请求不一致，保留原可用性快照")
         content = {
-            **normalize_availability(data),
+            **normalize_availability(data, instrument_type=body.scope.instrument_type),
             "field_id": body.field_id,
             "scope": body.scope.model_dump(),
         }