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/LICENSE

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+Copyright © 2017, Charmander <~@charmander.me>
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.

variant-api/node_modules/pg-int8/README.md

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+[![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

variant-api/node_modules/pg-int8/index.js

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+'use strict';
+
+// selected so (BASE - 1) * 0x100000000 + 0xffffffff is a safe integer
+var BASE = 1000000;
+
+function readInt8(buffer) {
+	var high = buffer.readInt32BE(0);
+	var low = buffer.readUInt32BE(4);
+	var sign = '';
+
+	if (high < 0) {
+		high = ~high + (low === 0);
+		low = (~low + 1) >>> 0;
+		sign = '-';
+	}
+
+	var result = '';
+	var carry;
+	var t;
+	var digits;
+	var pad;
+	var l;
+	var i;
+
+	{
+		carry = high % BASE;
+		high = high / BASE >>> 0;
+
+		t = 0x100000000 * carry + low;
+		low = t / BASE >>> 0;
+		digits = '' + (t - BASE * low);
+
+		if (low === 0 && high === 0) {
+			return sign + digits + result;
+		}
+
+		pad = '';
+		l = 6 - digits.length;
+
+		for (i = 0; i < l; i++) {
+			pad += '0';
+		}
+
+		result = pad + digits + result;
+	}
+
+	{
+		carry = high % BASE;
+		high = high / BASE >>> 0;
+
+		t = 0x100000000 * carry + low;
+		low = t / BASE >>> 0;
+		digits = '' + (t - BASE * low);
+
+		if (low === 0 && high === 0) {
+			return sign + digits + result;
+		}
+
+		pad = '';
+		l = 6 - digits.length;
+
+		for (i = 0; i < l; i++) {
+			pad += '0';
+		}
+
+		result = pad + digits + result;
+	}
+
+	{
+		carry = high % BASE;
+		high = high / BASE >>> 0;
+
+		t = 0x100000000 * carry + low;
+		low = t / BASE >>> 0;
+		digits = '' + (t - BASE * low);
+
+		if (low === 0 && high === 0) {
+			return sign + digits + result;
+		}
+
+		pad = '';
+		l = 6 - digits.length;
+
+		for (i = 0; i < l; i++) {
+			pad += '0';
+		}
+
+		result = pad + digits + result;
+	}
+
+	{
+		carry = high % BASE;
+		t = 0x100000000 * carry + low;
+		digits = '' + t % BASE;
+
+		return sign + digits + result;
+	}
+}
+
+module.exports = readInt8;

variant-api/node_modules/pg-int8/package.json

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+{
+	"name": "pg-int8",
+	"version": "1.0.1",
+	"description": "64-bit big-endian signed integer-to-string conversion",
+	"bugs": "https://github.com/charmander/pg-int8/issues",
+	"license": "ISC",
+	"files": [
+		"index.js"
+	],
+	"repository": {
+		"type": "git",
+		"url": "https://github.com/charmander/pg-int8"
+	},
+	"scripts": {
+		"test": "tap test"
+	},
+	"devDependencies": {
+		"@charmander/eslint-config-base": "1.0.2",
+		"tap": "10.7.3"
+	},
+	"engines": {
+		"node": ">=4.0.0"
+	}
+}