refactor(docker): docker-compose.yml ist der Pull-Weg, Bauen wandert nach .dev.yml

Namen getauscht: das Standard-Compose zieht jetzt die fertigen Registry-Images
(vorher docker-compose.prod.yml), die Build-Variante heisst docker-compose.dev.yml.
Weniger verwirrend, weil der Produktivfall ohne -f auskommt. Kopfkommentare,
README, CLAUDE.md, .env.example und build-push-images.mjs entsprechend angepasst.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docker-compose.dev.yml

@@ -0,0 +1,67 @@
+# NovaSonic — DEV/Selbstbauen: baut lokal aus den Dockerfiles statt Images zu ziehen. Die schweren
+# Deps (ffmpeg, Deno, yt-dlp, node libs) stecken in den Images, also sind RESTARTS sofort da und ein
+# Rebuild nach Code-Änderungen ist schnell (Docker cacht die Dep-Layer — nur der COPY-Layer ändert sich).
+#
+#   git pull
+#   docker compose -f docker-compose.dev.yml up -d --build   # geänderte Images neu bauen + starten
+#   docker compose -f docker-compose.dev.yml up -d           # nur starten, mit den gebauten Images
+#
+# Keine Registry nötig. Der Normalfall (fertige Images ziehen) ist docker-compose.yml.
+services:
+
+  # ── Frontend (nginx serving the built PWA) ───────────────────────────────────
+  novasonic-frontend:
+    build: .
+    container_name: novasonic-frontend
+    restart: unless-stopped
+    ports:
+      - "8080:80"          # route this port through your reverse proxy
+    environment:
+      - NAVIDROME_URL=${NAVIDROME_URL}   # pre-filled on the setup screen
+      - BACKEND_URL=${BACKEND_URL}
+      - SCROBBLE_URL=${SCROBBLE_URL}
+
+  # ── Backend (yt-dlp download server) ─────────────────────────────────────────
+  novasonic-backend:
+    build:
+      context: ./backend
+    container_name: novasonic-backend
+    restart: unless-stopped
+    volumes:
+      - ${MUSIC_PATH}:${MUSIC_PATH}      # exact path from .env, no remapping
+      - novasonic-data:/data             # writable data dir for overrides, state, etc.
+    ports:
+      - "3700:3700"
+    environment:
+      - PORT=3700
+      - MUSIC_PATH=${MUSIC_PATH}
+      - DATA_PATH=/data
+      - AUDIO_FMT=${AUDIO_FMT:-mp3}
+      - AUDIO_QUALITY=${AUDIO_QUALITY:-0}
+      - MAX_PARALLEL=${MAX_PARALLEL:-2}
+      - DOWNLOAD_BACKEND=${DOWNLOAD_BACKEND:-ytdlp}
+      - TICKETMASTER_API_KEY=${TICKETMASTER_API_KEY}
+      # Android APK download button — backend proxies the fixed Gitea release ("apk-latest").
+      - GITEA_URL=${GITEA_URL:-}
+      - GITEA_REPO=${GITEA_REPO:-}
+      - GITEA_TOKEN=${GITEA_TOKEN:-}
+      - GITEA_APK_TAG=${GITEA_APK_TAG:-apk-latest}
+
+  # ── Scrobble service (isolated timestamped play-log → stats + Wrapped) ────────
+  novasonic-scrobble:
+    build:
+      context: ./scrobble
+    container_name: novasonic-scrobble
+    restart: unless-stopped
+    volumes:
+      - novasonic-scrobble-data:/data    # own DB volume, isolated from downloads
+    ports:
+      - "3710:3710"
+    environment:
+      - PORT=3710
+      - DATA_PATH=/data
+      - NAVIDROME_URL=${NAVIDROME_URL}   # for ping.view auth verification
+
+volumes:
+  novasonic-data:
+  novasonic-scrobble-data: