chore: decouple webhook-worker from backend service dependency

compose.yml

@@ -71,12 +71,20 @@ services:
       context: .
       dockerfile: backend/Dockerfile
     command: ["rq", "worker", "webhook-dispatch", "-u", "redis://redis:6379/0"]
+    env_file:
+      - ./backend/.env.example
     depends_on:
-      - redis
+      redis:
-      - backend
+        condition: service_started
+      db:
+        condition: service_healthy
     environment:
+      DATABASE_URL: postgresql+psycopg://${POSTGRES_USER:-postgres}:${POSTGRES_PASSWORD:-postgres}@db:5432/${POSTGRES_DB:-mission_control}
+      AUTH_MODE: ${AUTH_MODE}
+      LOCAL_AUTH_TOKEN: ${LOCAL_AUTH_TOKEN}
       WEBHOOK_REDIS_URL: redis://redis:6379/0
       WEBHOOK_QUEUE_NAME: webhook-dispatch
+      WEBHOOK_DISPATCH_SCHEDULE_ID: webhook-dispatch-batch
     restart: unless-stopped
 
   webhook-dispatch-cron: