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/buffer-writer.d.ts

@@ -0,0 +1,16 @@
+/// <reference types="node" />
+export declare class Writer {
+    private size;
+    private buffer;
+    private offset;
+    private headerPosition;
+    constructor(size?: number);
+    private ensure;
+    addInt32(num: number): Writer;
+    addInt16(num: number): Writer;
+    addCString(string: string): Writer;
+    addString(string?: string): Writer;
+    add(otherBuffer: Buffer): Writer;
+    private join;
+    flush(code?: number): Buffer;
+}