Remove tests/ from repo, update .gitignore, improve ripper

- Remove tests/ directory from version control (added to .gitignore)
- Add .idea/ to .gitignore
- Ripper: CDDB lookup, non-interactive mode, English UI, file renaming
- Config: abcde format mapping, per-format quality options
- CLI: English help texts, new --no-cddb / --pipes / --parallel / --quality options

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

tests/test_models.py

@@ -1,42 +0,0 @@
-"""Tests für die Datenmodelle."""
-
-from musiksammlung.models import Album
-
-
-def test_album_folder_name_with_year():
-    album = Album(artist="Test", album="Mein Album", year=1987, discs=[])
-    assert album.folder_name == "Mein Album (1987)"
-
-
-def test_album_folder_name_without_year():
-    album = Album(artist="Test", album="Mein Album", year=None, discs=[])
-    assert album.folder_name == "Mein Album"
-
-
-def test_sanitize_name():
-    album = Album(artist='Art:ist', album='Al/bum?', year=None, discs=[])
-    assert ":" not in album.artist
-    assert "/" not in album.album
-    assert "?" not in album.album
-
-
-def test_album_from_json():
-    data = {
-        "artist": "Die Toten Hosen",
-        "album": "Opium fürs Volk",
-        "year": 1996,
-        "discs": [
-            {
-                "disc_number": 1,
-                "tracks": [
-                    {"track_number": 1, "title": "Bonnie & Clyde"},
-                    {"track_number": 2, "title": "Zehn kleine Jägermeister"},
-                ],
-            }
-        ],
-    }
-    album = Album.model_validate(data)
-    assert album.artist == "Die Toten Hosen"
-    assert len(album.discs) == 1
-    assert len(album.discs[0].tracks) == 2
-    assert album.discs[0].tracks[1].title == "Zehn kleine Jägermeister"