fix: close data integrity and hot-reload review findings

Backfill same-day snapshots for newly added or restored videos, preserve successful fan snapshots on resume, persist incomplete state before forced re-runs, and split collection completion from backup completion so failed backups can retry without API calls. Reject missing data payloads instead of treating them as empty folders, guard against mass-unfav on suspicious empty remote folders, rebuild Bilibili clients when credentials change, recompute primary folder ownership from active relations with per-folder fav_time, preserve original titles for dropped invalid videos, poll config every 60 seconds, and fix favsort verify interval and mixed resource types.

reaction_board/bilibili/client.py

@@ -262,6 +262,20 @@ class BilibiliClient:
             raise self._api_error(payload)
         return payload
 
+    @staticmethod
+    def _data_list(payload: Mapping[str, Any], name: str) -> list[Any]:
+        """区分“真实空数组”与“协议缺字段”。
+
+        实测空收藏夹返回 ``{"code":0,"data":[]}``；缺少 ``data`` 或为 ``null``
+        都不是已知契约，必须中止，避免被误判成空收藏夹后批量改状态。
+        """
+        if "data" not in payload:
+            raise BilibiliProtocolError(f"{name} 响应缺少 data 字段")
+        data = payload["data"]
+        if not isinstance(data, list):
+            raise BilibiliProtocolError(f"{name} data 不是数组")
+        return data
+
     # ------------------------------------------------------------ fav
 
     def fav_ids(self, media_id: int) -> list[FavId]:
@@ -269,11 +283,7 @@ class BilibiliClient:
             f"{BASE}/x/v3/fav/resource/ids?media_id={int(media_id)}&platform=web"
         )
         payload = self.get_json(url)
-        data = payload.get("data")
-        if data is None:
-            data = []
-        if not isinstance(data, list):
-            raise BilibiliProtocolError("fav/resource/ids data 不是数组")
+        data = self._data_list(payload, "fav/resource/ids")
         out: list[FavId] = []
         for index, item in enumerate(data):
             if not isinstance(item, Mapping):
@@ -320,11 +330,7 @@ class BilibiliClient:
                 f"&platform=web&folder_mid={fmid}&folder_id={int(media_id)}"
             )
             payload = self.get_json(url)
-            data = payload.get("data")
-            if data is None:
-                data = []
-            if not isinstance(data, list):
-                raise BilibiliProtocolError("fav/resource/infos data 不是数组")
+            data = self._data_list(payload, "fav/resource/infos")
             chunk_set = set(chunk)
             for item in data:
                 if not isinstance(item, Mapping):