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>

src/musiksammlung/playlist.py

@@ -0,0 +1,57 @@
+"""M3U-Playlist-Generierung für Jellyfin."""
+
+from __future__ import annotations
+
+import logging
+from pathlib import Path
+
+from musiksammlung.models import Album
+from musiksammlung.organizer import _sanitize_filename
+
+logger = logging.getLogger(__name__)
+
+
+def generate_playlist(album: Album, album_dir: Path) -> Path:
+    """Erzeugt eine M3U-Playlist für das gesamte Album.
+
+    Die Playlist liegt im Album-Root und referenziert alle Tracks
+    über relative Pfade (CD1/01 Titel.flac, CD2/01 Titel.flac, ...).
+
+    Returns:
+        Pfad zur erzeugten Playlist-Datei.
+    """
+    playlist_name = _sanitize_filename(album.album) + ".m3u"
+    playlist_path = album_dir / playlist_name
+    multi_disc = len(album.discs) > 1
+
+    lines = ["#EXTM3U"]
+
+    for disc in album.discs:
+        if multi_disc:
+            disc_prefix = f"CD{disc.disc_number}/"
+        else:
+            disc_prefix = ""
+
+        for track in disc.tracks:
+            safe_title = _sanitize_filename(track.title)
+            # Audiodatei im Zielverzeichnis finden
+            pattern = f"{track.track_number:02d} {safe_title}.*"
+            if multi_disc:
+                search_dir = album_dir / f"CD{disc.disc_number}"
+            else:
+                search_dir = album_dir
+
+            matches = list(search_dir.glob(pattern))
+            if matches:
+                filename = matches[0].name
+            else:
+                # Fallback: generischer Name mit .flac
+                filename = f"{track.track_number:02d} {safe_title}.flac"
+                logger.warning("Datei nicht gefunden, Fallback: %s", filename)
+
+            lines.append(f"#EXTINF:0,{track.title}")
+            lines.append(f"{disc_prefix}{filename}")
+
+    playlist_path.write_text("\n".join(lines) + "\n", encoding="utf-8")
+    logger.info("Playlist erstellt: %s", playlist_path)
+    return playlist_path