fix: 修复字段错误，凭据刷新从第二天开始

commands.py

@@ -54,7 +54,7 @@ async def upper_thumb():
         other_tasks.extend(
             [
                 upper.save_metadata(),
-                download_content(upper.thumb_url, upper.thumb_path),
+                download_content(upper.thumb, upper.thumb_path),
             ]
         )
     await asyncio.gather(*makedir_tasks)

processor.py

@@ -81,10 +81,12 @@ async def manage_model(medias: list[dict], fav_list: FavoriteList) -> None:
 
 async def process() -> None:
     global anchor
-    if datetime.date.today() >= anchor and await credential.check_refresh():
+    if (
+        today := datetime.date.today()
+    ) > anchor and await credential.check_refresh():
         try:
             await credential.refresh()
-            anchor = datetime.date.today() + datetime.timedelta(days=1)
+            anchor = today
             logger.info("Credential refreshed.")
         except Exception:
             logger.exception("Failed to refresh credential.")