refactor: add folder rename configuration and service

Add configurable folder rename patterns via settings with anime_folder_rename_regex and custom_pattern options. Integrate into SerieScanner and SeriesApp for consistent episode organization.

tests/unit/test_serie_scanner.py

@@ -547,11 +547,31 @@ class TestReadDataFromFile:
 
             scanner = SerieScanner(tmpdir, mock_loader)
             result = scanner._SerieScanner__read_data_from_file("Empty")
-            # Step 4 generates key from folder name when no files exist
+            # Step 5 (was Step 4) generates key from folder name when no files exist
             assert result is not None
             assert isinstance(result, Serie)
             assert result.key == "empty"
 
+    def test_scan_key_override_used_instead_of_generated(self, mock_loader):
+        """Should use override key when folder name matches override dict."""
+        import tempfile
+
+        with tempfile.TemporaryDirectory() as tmpdir:
+            anime_folder = os.path.join(tmpdir, "Anyway, I'm Falling in Love with You (2025)")
+            os.makedirs(anime_folder)
+
+            overrides = {
+                "Anyway, I'm Falling in Love with You (2025)": "anyway-im-falling-in-love-with-you-2025"
+            }
+            scanner = SerieScanner(tmpdir, mock_loader, scan_key_overrides=overrides)
+            result = scanner._SerieScanner__read_data_from_file(
+                "Anyway, I'm Falling in Love with You (2025)"
+            )
+            # Override key should be used instead of generated key
+            assert result is not None
+            assert isinstance(result, Serie)
+            assert result.key == "anyway-im-falling-in-love-with-you-2025"
+
 
 class TestReinit:
     """Test reinit method."""