Add product variants API, deployment scripts, and documentation

- Add Node.js variant-api server with PostgreSQL integration
- Add new utility scripts for system verification and website status
- Update CI/CD workflow configuration
- Add color variant solution documentation
- Add product variants JavaScript support
- Update gitignore for new build artifacts

variant-api/package.json

@@ -0,0 +1,12 @@
+{
+  "name": "skyartshop-variant-api",
+  "version": "1.0.0",
+  "description": "Standalone API service for product color variants",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js"
+  },
+  "dependencies": {
+    "pg": "^8.11.3"
+  }
+}