♻️ 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/unist-util-visit-children/lib/index.js

@@ -1,58 +0,0 @@
-/**
- * @typedef {import('unist').Parent} Parent
- */
-
-/**
- * @template {Parent} Kind
- *   Node type.
- * @callback Visitor
- *   Callback called for each `child` in `parent` later given to `visit`.
- * @param {Kind['children'][number]} child
- *   Child of parent.
- * @param {number} index
- *   Position of `child` in parent.
- * @param {Kind} parent
- *   Parent node.
- * @returns {undefined}
- *   Nothing.
- */
-
-/**
- * @template {Parent} Kind
- *   Node type.
- * @callback Visit
- *   Function to call the bound `visitor` for each child in `parent`.
- * @param {Kind} node
- *   Parent node.
- * @returns {undefined}
- *   Nothing.
- */
-
-/**
- * Wrap `visitor` to be called for each child in the nodes later given to
- * `visit`.
- *
- * @template {Parent} Kind
- *   Node type.
- * @param {Visitor<Kind>} visitor
- *   Callback called for each `child` in `parent` later given to `visit`.
- * @returns {Visit<Kind>}
- *   Function to call the bound `visitor` for each child in `parent`.
- */
-export function visitChildren(visitor) {
-  return visit
-
-  /** @type {Visit<Kind>} */
-  function visit(parent) {
-    const children = parent && parent.children
-    let index = -1
-
-    if (!children) {
-      throw new Error('Missing children in `parent` for `visit`')
-    }
-
-    while (++index in children) {
-      visitor(children[index], index, parent)
-    }
-  }
-}