Add project skeleton: CLI pipeline for CD digitization

Modular Python package with Typer CLI (scan/apply/process commands),
Pydantic data models, OCR via Tesseract, LLM-based tracklist parsing,
mutagen audio tagging, M3U playlist generation, and cover processing.
Includes 8 passing tests and ruff lint config.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/test_organizer.py

@@ -0,0 +1,78 @@
+"""Tests für den Organizer."""
+
+from pathlib import Path
+
+from musiksammlung.models import Album, Disc, Track
+from musiksammlung.organizer import build_mapping, discover_audio_files
+
+
+def test_discover_audio_files(tmp_path: Path):
+    """Findet und sortiert Audiodateien korrekt."""
+    (tmp_path / "Track_03.flac").touch()
+    (tmp_path / "Track_01.flac").touch()
+    (tmp_path / "Track_02.flac").touch()
+    (tmp_path / "cover.jpg").touch()  # soll ignoriert werden
+
+    files = discover_audio_files(tmp_path)
+    assert len(files) == 3
+    assert files[0].name == "Track_01.flac"
+    assert files[2].name == "Track_03.flac"
+
+
+def test_build_mapping_single_disc(tmp_path: Path):
+    """Mapping für ein Single-CD-Album."""
+    (tmp_path / "Track_01.flac").touch()
+    (tmp_path / "Track_02.flac").touch()
+
+    album = Album(
+        artist="TestArtist",
+        album="TestAlbum",
+        year=2000,
+        discs=[
+            Disc(
+                disc_number=1,
+                tracks=[
+                    Track(track_number=1, title="Erster Song"),
+                    Track(track_number=2, title="Zweiter Song"),
+                ],
+            )
+        ],
+    )
+
+    output = tmp_path / "output"
+    mapping = build_mapping(album, tmp_path, output)
+
+    assert len(mapping) == 2
+    targets = list(mapping.values())
+    assert targets[0].name == "01 Erster Song.flac"
+    assert targets[1].name == "02 Zweiter Song.flac"
+    # Single-Disc: kein CD1-Unterordner
+    assert "CD1" not in str(targets[0])
+
+
+def test_build_mapping_multi_disc(tmp_path: Path):
+    """Mapping für ein Multi-CD-Album."""
+    cd1 = tmp_path / "CD1"
+    cd2 = tmp_path / "CD2"
+    cd1.mkdir()
+    cd2.mkdir()
+    (cd1 / "Track_01.flac").touch()
+    (cd2 / "Track_01.flac").touch()
+
+    album = Album(
+        artist="Artist",
+        album="Box Set",
+        year=1999,
+        discs=[
+            Disc(disc_number=1, tracks=[Track(track_number=1, title="Song A")]),
+            Disc(disc_number=2, tracks=[Track(track_number=1, title="Song B")]),
+        ],
+    )
+
+    output = tmp_path / "output"
+    mapping = build_mapping(album, tmp_path, output)
+
+    assert len(mapping) == 2
+    targets = list(mapping.values())
+    assert "CD1" in str(targets[0])
+    assert "CD2" in str(targets[1])