fix(ci): use retry loop for frontend health check

The frontend container needs more time to initialize. Replace fixed
sleep with a retry loop that polls the container health status up to
30 times (150s max) before checking.

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

.gitea/workflows/deploy.yml

@@ -42,8 +42,15 @@ jobs:
 
       - name: Health check
         run: |
-          echo "Waiting for services to start..."
-          sleep 20
+          echo "Waiting for all containers to become healthy..."
+          for i in $(seq 1 30); do
+            STATUS=$(docker inspect --format='{{.State.Health.Status}}' galaxis-po-frontend 2>/dev/null || echo "missing")
+            if [ "$STATUS" = "healthy" ]; then
+              break
+            fi
+            echo "  frontend: $STATUS (attempt $i/30)"
+            sleep 5
+          done
           docker compose --project-name galaxis-po --env-file .env.prod -f docker-compose.prod.yml ps
           docker exec galaxis-po-backend python -c "import urllib.request; urllib.request.urlopen('http://localhost:8000/health')" || { echo "Backend: FAILED"; exit 1; }
           echo "Backend: OK"