fix: preserve season zero semantics (#6150)

tests/test_filemanager_season_zero.py

@@ -0,0 +1,18 @@
+from types import SimpleNamespace
+from unittest.mock import patch
+
+from app.core.context import MediaInfo
+from app.modules.filemanager import FileManagerModule
+from app.schemas.types import MediaType
+
+
+def test_local_media_exists_keeps_special_season_zero():
+    """本地 S00 文件必须归入特别季，不能计入第一季。"""
+    module = FileManagerModule()
+    module.media_files = lambda _mediainfo: [SimpleNamespace(basename="Test.Show.S00E01.mkv")]
+    mediainfo = MediaInfo(title="Test Show", type=MediaType.TV)
+
+    with patch("app.modules.filemanager.settings.LOCAL_EXISTS_SEARCH", True):
+        exists = module.media_exists(mediainfo)
+
+    assert exists.seasons == {0: [1]}