feat(media): aggregate aliases from enabled metadata sources

tests/test_tmdb_auxiliary.py

@@ -1,5 +1,5 @@
 from types import SimpleNamespace
-from unittest.mock import Mock
+from unittest.mock import Mock, patch
 
 from app.chain.media import MediaChain
 from app.domain.context import MediaInfo
@@ -23,11 +23,11 @@ class _FakeTmdbModule:
         """返回模块调度优先级。"""
         return 0
 
-    def recognize_media(self, **kwargs):
-        """与宿主识别模块一致：只应答 TMDB 来源的请求。"""
+    def get_media_auxiliary_info(self, **kwargs):
+        """与宿主附加信息模块一致：只应答 TMDB 来源的请求。"""
         if kwargs.get("media_source") != MediaSource.TMDB:
-            return None
-        return self.result
+            return []
+        return [self.result]
 
 
 def _make_chain(tmdb_media: MediaInfo) -> MediaChain:
@@ -128,3 +128,77 @@ def test_tmdb_supplement_uses_current_season_year_and_keeps_season_zero() -> Non
 
     assert tmdb_meta.begin_season == 0
     assert tmdb_meta.year == "2024"
+
+
+def test_multi_source_auxiliary_merges_aliases_but_only_tmdb_special_fields() -> None:
+    """多来源只合并标题候选，分类、风格和外部 ID 必须由 TMDB 独占。"""
+    primary = MediaInfo(
+        media_source=MediaSource.Douban,
+        media_id="1",
+        type=MediaType.TV,
+        title="葬送的芙莉莲",
+        names=["Frieren"],
+    )
+    anilist = MediaInfo(
+        media_source=MediaSource.AniList,
+        media_id="154587",
+        type=MediaType.TV,
+        title="Sousou no Frieren",
+        names=["FRIEREN", "Frieren: Beyond Journey's End"],
+        category="动画冲突分类",
+        genre_ids=[99],
+        imdb_id="tt-conflict",
+    )
+    tmdb = MediaInfo(
+        tmdb_info={
+            "id": 209867,
+            "media_type": MediaType.TV,
+            "name": "Frieren: Beyond Journey's End",
+            "genre_ids": [16, 18],
+            "external_ids": {"imdb_id": "tt22248376", "tvdb_id": 424536},
+        }
+    )
+    tmdb.category = "日本动画"
+
+    result = MediaChain._merge_media_auxiliary(
+        primary,
+        [anilist, tmdb],
+        (MediaSource.AniList, MediaSource.TMDB),
+    )
+
+    assert result.names == [
+        "葬送的芙莉莲",
+        "Frieren",
+        "Sousou no Frieren",
+        "Frieren: Beyond Journey's End",
+    ]
+    assert result.category == "日本动画"
+    assert result.genre_ids == [16, 18]
+    assert result.imdb_id == "tt22248376"
+    assert result.tvdb_id == 424536
+
+
+def test_supplement_media_info_uses_configured_source_union() -> None:
+    """未显式传来源时，Chain 应把用户的 SEARCH_SOURCE 多选完整传给 provider。"""
+    primary = MediaInfo(
+        media_source=MediaSource.Douban,
+        media_id="1",
+        type=MediaType.TV,
+        title="测试剧",
+    )
+    chain = object.__new__(MediaChain)
+    chain.run_module = Mock(return_value=[])
+
+    with patch(
+        "app.chain.media.get_chain_runtime_config_snapshot",
+        return_value=SimpleNamespace(search_source="douban,themoviedb,anilist"),
+    ):
+        result = chain.supplement_media_info(primary)
+
+    assert result is primary
+    chain.run_module.assert_called_once_with(
+        "get_media_auxiliary_info",
+        mediainfo=primary,
+        media_source=(MediaSource.Douban, MediaSource.TMDB, MediaSource.AniList),
+        metainfo=None,
+    )