feat(recognize): 影视与音乐统一插件辅助识别链路

- 音乐并入 select_recognize_source 统一选择流程，支持插件优先/原生优先，按 MusicNameRecognize 事件与远端身份谓词区分
- 新增 MediaRecognize 链式事件，与 MusicMediaRecognize 对称，统一为 _supplement_media_recognize 补充识别
- 插件回写统一要求 source 与远端身份，采信后统一上报共享识别
- 插件优先模式下辅助识别未取得身份时保留原生兜底结果

tests/test_media_recognize_share_statistics.py

@@ -40,9 +40,16 @@ def _mock_counter(monkeypatch) -> Mock:
     return increment
 
 
+def _bare_chain() -> ChainBase:
+    """构造不执行初始化的识别链实例，并挂上无插件响应的事件管理器桩。"""
+    chain = object.__new__(ChainBase)
+    chain.eventmanager = Mock(check=Mock(return_value=False))
+    return chain
+
+
 def test_sync_shared_recognize_success_increments_persisted_count(monkeypatch):
     """同步共享识别二次识别成功后应累计一次命中。"""
-    chain = object.__new__(ChainBase)
+    chain = _bare_chain()
     meta = _build_meta("共享识别电影")
     media = MediaInfo(
         title="共享识别电影",
@@ -73,7 +80,7 @@ def test_sync_shared_recognize_success_increments_persisted_count(monkeypatch):
 
 def test_sync_shared_result_without_local_match_does_not_increment(monkeypatch):
     """共享接口返回数据但二次识别失败时不应累计命中。"""
-    chain = object.__new__(ChainBase)
+    chain = _bare_chain()
     meta = _build_meta("共享识别失败电影")
     increment = _mock_counter(monkeypatch)
     monkeypatch.setattr("app.chain.settings.MEDIA_RECOGNIZE_SHARE", True)
@@ -97,7 +104,7 @@ def test_sync_shared_result_without_local_match_does_not_increment(monkeypatch):
 
 def test_async_shared_recognize_success_increments_persisted_count(monkeypatch):
     """异步共享识别二次识别成功后应累计一次命中。"""
-    chain = object.__new__(ChainBase)
+    chain = _bare_chain()
     meta = _build_meta("异步共享识别电影")
     media = MediaInfo(
         title="异步共享识别电影",