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/node_modules/pg-int8/README.md

@@ -0,0 +1,16 @@
+[![Build status][ci image]][ci]
+
+64-bit big-endian signed integer-to-string conversion designed for [pg][].
+
+```js
+const readInt8 = require('pg-int8');
+
+readInt8(Buffer.from([0, 1, 2, 3, 4, 5, 6, 7]))
+// '283686952306183'
+```
+
+
+  [pg]: https://github.com/brianc/node-postgres
+
+  [ci]: https://travis-ci.org/charmander/pg-int8
+  [ci image]: https://api.travis-ci.org/charmander/pg-int8.svg