♻️ 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

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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.d.ts

@@ -1,48 +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<Kind extends import("unist").Parent>(visitor: Visitor<Kind>): Visit<Kind>;
-export type Parent = import('unist').Parent;
-/**
- * Callback called for each `child` in `parent` later given to `visit`.
- */
-export type Visitor<Kind extends import("unist").Parent> = (child: Kind['children'][number], index: number, parent: Kind) => undefined;
-/**
- * Function to call the bound `visitor` for each child in `parent`.
- */
-export type Visit<Kind extends import("unist").Parent> = (node: Kind) => undefined;