feat(conversions): end-to-end PPT/PPTX/ODP -> PDF pipeline with RQ worker + Gotenberg

DB/model

Add Conversion model + ConversionStatus enum (pending, processing, ready, failed)
Alembic migrations: create conversions table, indexes, unique (source_event_media_id, target_format, file_hash), and NOT NULL on file_hash
API

Enqueue on upload (ppt|pptx|odp) in routes/eventmedia.py: compute sha256, upsert Conversion, enqueue job
New routes:
POST /api/conversions/<media_id>/pdf — ensure/enqueue conversion
GET /api/conversions/<media_id>/status — latest status/details
GET /api/files/converted/<path> — serve converted PDFs
Register conversions blueprint in wsgi
Worker

server/worker.py: convert_event_media_to_pdf
Calls Gotenberg /forms/libreoffice/convert, writes to server/media/converted/
Updates Conversion status, timestamps, error messages
Fix media root resolution to /server/media
Prefer function enqueue over string path; expose server.worker in package init for RQ string compatibility
Queue/infra

server/task_queue.py: RQ queue helper (REDIS_URL, default redis://redis:6379/0)
docker-compose:
Add redis and gotenberg services
Add worker service (rq worker conversions)
Pass REDIS_URL and GOTENBERG_URL to server/worker
Mount shared media volume in prod for API/worker parity
docker-compose.override:
Add dev redis/gotenberg/worker services
Ensure PYTHONPATH + working_dir allow importing server.worker
Use rq CLI instead of python -m rq for worker
Dashboard dev: run as appropriate user/root and pre-create/chown caches to avoid EACCES
Dashboard dev UX

Vite: set cacheDir .vite to avoid EACCES in node_modules
Disable Node inspector by default to avoid port conflicts
Docs

Update copilot-instructions.md with conversion system: flow, services, env vars, endpoints, storage paths, and data model

docker-compose.yml

@@ -68,12 +68,16 @@ services:
       - ./mosquitto/data:/mosquitto/data
       - ./mosquitto/log:/mosquitto/log
     ports:
-      - "1883:1883"  # Standard MQTT
-      - "9001:9001"  # WebSocket (falls benötigt)
+      - "1883:1883" # Standard MQTT
+      - "9001:9001" # WebSocket (falls benötigt)
     networks:
       - infoscreen-net
     healthcheck:
-      test: ["CMD-SHELL", "mosquitto_pub -h localhost -t test -m 'health' || exit 1"]
+      test:
+        [
+          "CMD-SHELL",
+          "mosquitto_pub -h localhost -t test -m 'health' || exit 1",
+        ]
       interval: 30s
       timeout: 5s
       retries: 3
@@ -98,10 +102,14 @@ services:
       MQTT_BROKER_URL: ${MQTT_BROKER_URL}
       MQTT_USER: ${MQTT_USER}
       MQTT_PASSWORD: ${MQTT_PASSWORD}
+      REDIS_URL: "${REDIS_URL:-redis://redis:6379/0}"
+      GOTENBERG_URL: "${GOTENBERG_URL:-http://gotenberg:3000}"
     ports:
       - "8000:8000"
     networks:
       - infoscreen-net
+    volumes:
+      - media-data:/app/server/media
     healthcheck:
       test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
       interval: 30s
@@ -140,6 +148,7 @@ services:
 
   scheduler:
     build:
+      context: .
       dockerfile: scheduler/Dockerfile
     image: infoscreen-scheduler:latest
     container_name: infoscreen-scheduler
@@ -157,6 +166,41 @@ services:
     networks:
       - infoscreen-net
 
+  redis:
+    image: redis:7-alpine
+    container_name: infoscreen-redis
+    restart: unless-stopped
+    networks:
+      - infoscreen-net
+
+  gotenberg:
+    image: gotenberg/gotenberg:8
+    container_name: infoscreen-gotenberg
+    restart: unless-stopped
+    networks:
+      - infoscreen-net
+
+  worker:
+    build:
+      context: .
+      dockerfile: server/Dockerfile
+    image: infoscreen-worker:latest
+    container_name: infoscreen-worker
+    restart: unless-stopped
+    depends_on:
+      - redis
+      - gotenberg
+      - db
+    environment:
+      DB_CONN: "mysql+pymysql://${DB_USER}:${DB_PASSWORD}@db/${DB_NAME}"
+      REDIS_URL: "${REDIS_URL:-redis://redis:6379/0}"
+      GOTENBERG_URL: "${GOTENBERG_URL:-http://gotenberg:3000}"
+      PYTHONPATH: /app
+    command: ["rq", "worker", "conversions"]
+    networks:
+      - infoscreen-net
+
 volumes:
   server-pip-cache:
   db-data:
+  media-data: