Fix health check: use DEPLOY_PORT variable for host port

The frontend port varies per deployment (80 on dev, 8088 on
dedicated host). Use a Gitea variable so it works across environments.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/deploy.yml

@@ -56,7 +56,7 @@ jobs:
         run: |
           echo "Waiting for services to start..."
           sleep 30
-          curl -f http://localhost/health || exit 1
+          curl -f http://localhost:${{ vars.DEPLOY_PORT }}/health || exit 1
 
       - name: Prune old images
         if: success()