♻️ 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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✅ Privacy/Terms links in footer
✅ 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/index.js

@@ -1,27 +0,0 @@
-'use strict';
-const {deserialize} = require('./deserialize.js');
-const {serialize} = require('./serialize.js');
-
-/**
- * @typedef {Array<string,any>} Record a type representation
- */
-
-/**
- * Returns an array of serialized Records.
- * @param {any} any a serializable value.
- * @param {{transfer?: any[], json?: boolean, lossy?: boolean}?} options an object with
- * a transfer option (ignored when polyfilled) and/or non standard fields that
- * fallback to the polyfill if present.
- * @returns {Record[]}
- */
-Object.defineProperty(exports, '__esModule', {value: true}).default = typeof structuredClone === "function" ?
-  /* c8 ignore start */
-  (any, options) => (
-    options && ('json' in options || 'lossy' in options) ?
-      deserialize(serialize(any, options)) : structuredClone(any)
-  ) :
-  (any, options) => deserialize(serialize(any, options));
-  /* c8 ignore stop */
-
-exports.deserialize = deserialize;
-exports.serialize = serialize;