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-protocol/dist/index.d.ts

@@ -0,0 +1,6 @@
+/// <reference types="node" />
+import { DatabaseError } from './messages';
+import { serialize } from './serializer';
+import { MessageCallback } from './parser';
+export declare function parse(stream: NodeJS.ReadableStream, callback: MessageCallback): Promise<void>;
+export { serialize, DatabaseError };