fix(ci): use docker-user heredoc for deploy and fix SSH port

Closes #45
Assisted-by: Claude:claude-sonnet-4-6

.github/workflows/ui.yml

@@ -107,6 +107,7 @@ jobs:
           key: ${{ secrets.SSH_PRIVATE_KEY }}
           port: ${{ secrets.SSH_PORT }}
           script: |
+            docker-user << 'EOF'
             docker pull ${{ needs.docker.outputs.sha_tag }}
             docker stop dashboard-ui 2>/dev/null || true
             docker rm   dashboard-ui 2>/dev/null || true
@@ -115,3 +116,4 @@ jobs:
               --restart unless-stopped \
               -p 80:80 \
               ${{ needs.docker.outputs.sha_tag }}
+            EOF