compose: Backend-Service in server-stack.yml ergänzt

- Backend-Container mit Dockerfile aus server/backend/
- Postgres healthcheck damit Backend erst startet wenn DB bereit ist
- uploads-Volume für hochgeladene Dateien
- MORZ_INFOBOARD_DATABASE_URL zeigt auf postgres-Service

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

compose/server-stack.yml

@@ -9,6 +9,11 @@ services:
       - "5432:5432"
     volumes:
       - postgres-data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U morz_infoboard"]
+      interval: 5s
+      timeout: 5s
+      retries: 10
 
   mosquitto:
     image: eclipse-mosquitto:2
@@ -17,5 +22,23 @@ services:
     volumes:
       - ./mosquitto.conf:/mosquitto/config/mosquitto.conf:ro
 
+  backend:
+    build:
+      context: ../server/backend
+      dockerfile: Dockerfile
+    ports:
+      - "8080:8080"
+    environment:
+      MORZ_INFOBOARD_HTTP_ADDR: ":8080"
+      MORZ_INFOBOARD_DATABASE_URL: "postgres://morz_infoboard:morz_infoboard@postgres:5432/morz_infoboard?sslmode=disable"
+      MORZ_INFOBOARD_UPLOAD_DIR: "/uploads"
+    volumes:
+      - uploads:/uploads
+    depends_on:
+      postgres:
+        condition: service_healthy
+    restart: unless-stopped
+
 volumes:
   postgres-data:
+  uploads: