♻️ 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/stringify-entities/lib/util/to-named.js

@@ -1,57 +0,0 @@
-import {characterEntitiesLegacy} from 'character-entities-legacy'
-import {characterEntitiesHtml4} from 'character-entities-html4'
-import {dangerous} from '../constant/dangerous.js'
-
-const own = {}.hasOwnProperty
-
-/**
- * `characterEntitiesHtml4` but inverted.
- *
- * @type {Record<string, string>}
- */
-const characters = {}
-
-/** @type {string} */
-let key
-
-for (key in characterEntitiesHtml4) {
-  if (own.call(characterEntitiesHtml4, key)) {
-    characters[characterEntitiesHtml4[key]] = key
-  }
-}
-
-const notAlphanumericRegex = /[^\dA-Za-z]/
-
-/**
- * Configurable ways to encode characters as named references.
- *
- * @param {number} code
- * @param {number} next
- * @param {boolean|undefined} omit
- * @param {boolean|undefined} attribute
- * @returns {string}
- */
-export function toNamed(code, next, omit, attribute) {
-  const character = String.fromCharCode(code)
-
-  if (own.call(characters, character)) {
-    const name = characters[character]
-    const value = '&' + name
-
-    if (
-      omit &&
-      characterEntitiesLegacy.includes(name) &&
-      !dangerous.includes(name) &&
-      (!attribute ||
-        (next &&
-          next !== 61 /* `=` */ &&
-          notAlphanumericRegex.test(String.fromCharCode(next))))
-    ) {
-      return value
-    }
-
-    return value + ';'
-  }
-
-  return ''
-}