add(metadata) search also for narrator if same title

tests/test_import_flow.py

@@ -168,3 +168,37 @@ def test_audio_tags_written_on_import(client):
     assert str(tags["TXXX:SERIES"]) == "Die drei ??? Kids"
     assert str(tags["TXXX:SERIES-PART"]) == "85"
     assert str(tags["TRCK"]) == "1/2"
+
+
+def test_narrator_in_path_and_tags(client):
+    from mutagen.id3 import ID3
+
+    root = client.tmp_path / "library" / "hp"
+    lib_id = client.post("/api/libraries", json={
+        "name": "HP", "media_type": "audiobook", "root_path": str(root),
+        "folder_template": "{Author}/{Title} ({Narrator})", "file_template": "{Title}",
+    }).json()["id"]
+    beck = client.post("/api/requests", json={
+        "library_id": lib_id, "title": "Harry Potter und der Stein der Weisen",
+        "authors": "J.K. Rowling", "narrator": "Rufus Beck",
+    }).json()
+    client.post("/api/requests", json={
+        "library_id": lib_id, "title": "Harry Potter und der Stein der Weisen",
+        "authors": "J.K. Rowling", "narrator": "Felix von Manteuffel",
+    })
+
+    f = client.downloads / "Harry Potter Stein der Weisen (Rufus Beck).mp3"
+    f.write_bytes(b"")
+    items = client.get("/api/import/scan").json()["items"]
+    assert items[0]["suggested_request_id"] == beck["id"]
+
+    resp = client.post("/api/import", json={"items": [{
+        "path": items[0]["path"], "is_dir": False,
+        "files": items[0]["files"], "request_id": beck["id"],
+    }]})
+    assert resp.json()["results"][0]["ok"]
+    dest = (root / "J.K. Rowling"
+            / "Harry Potter und der Stein der Weisen (Rufus Beck)"
+            / "Harry Potter und der Stein der Weisen.mp3")
+    assert dest.is_file()
+    assert str(ID3(dest)["TCOM"]) == "Rufus Beck"