♻️ Restructure: Move Astro to repository root

BREAKING CHANGE: Astro project is now at repository root
- Removed dealplustech-astro subdirectory
- Moved all Astro files to root
- Updated PostCSS config to .cjs
- Removed old Next.js files

✅ 11 pages built successfully
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✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/@ungap/structured-clone/cjs/json.js

@@ -1,24 +0,0 @@
-'use strict';
-/*! (c) Andrea Giammarchi - ISC */
-
-const {deserialize} = require('./deserialize.js');
-const {serialize} = require('./serialize.js');
-
-const {parse: $parse, stringify: $stringify} = JSON;
-const options = {json: true, lossy: true};
-
-/**
- * Revive a previously stringified structured clone.
- * @param {string} str previously stringified data as string.
- * @returns {any} whatever was previously stringified as clone.
- */
-const parse = str => deserialize($parse(str));
-exports.parse = parse;
-
-/**
- * Represent a structured clone value as string.
- * @param {any} any some clone-able value to stringify.
- * @returns {string} the value stringified.
- */
-const stringify = any => $stringify(serialize(any, options));
-exports.stringify = stringify;