Add an isolated beta compose stack

docker-compose.beta.yml

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+# Beta stack (beta.worship.hesed.sbs). Separate from prod on purpose: own named
+# volumes (no shared DB or media drive), no hardcoded Traefik labels (Dokploy
+# injects the domain routing), no lyrics/piano workers.
+services:
+  ytplayer:
+    build: .
+    restart: unless-stopped
+    volumes:
+      - ytplayer-beta-data:/app/data
+    environment:
+      PORT: "3000"
+      DB_PATH: "/app/data/ytplayer.db"
+      MEDIA_DIR: "/app/data/media"
+      UPLOAD_DIR: "/app/data/uploads"
+      MEDIA_CACHE_MAX_BYTES: "10737418240"
+      APP_VERSION: "1.0.0-beta"
+      ADMIN_PASSWORD: "${ADMIN_PASSWORD:-}"
+      P2P_ENABLED: "${P2P_ENABLED:-0}"
+    healthcheck:
+      test: ["CMD", "curl", "-sf", "http://localhost:3000/api/version"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+      start_period: 15s
+    networks:
+      - dokploy-network
+
+volumes:
+  ytplayer-beta-data:
+    driver: local
+
+networks:
+  dokploy-network:
+    external: true