feat(lidarr): add Artist - Track query splitter

tests/test_lidarr_match.py

@@ -0,0 +1,18 @@
+import server.mf  # noqa: F401 — loads musicfetch, registers musicfetch_core in sys.modules
+import musicfetch_core as mf
+
+
+def test_split_query_with_dash():
+    assert mf._split_query("Daft Punk - Discovery") == ("Daft Punk", "Discovery")
+
+
+def test_split_query_no_dash():
+    assert mf._split_query("Daft Punk") == ("Daft Punk", None)
+
+
+def test_split_query_splits_on_first_dash_only():
+    assert mf._split_query("A - B - C") == ("A", "B - C")
+
+
+def test_split_query_strips_whitespace():
+    assert mf._split_query("  Daft Punk  -  Discovery  ") == ("Daft Punk", "Discovery")