♻️ 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-stringify-position/lib/index.d.ts

@@ -1,61 +0,0 @@
-/**
- * @typedef {import('unist').Node} Node
- * @typedef {import('unist').Point} Point
- * @typedef {import('unist').Position} Position
- */
-/**
- * @typedef NodeLike
- * @property {string} type
- * @property {PositionLike | null | undefined} [position]
- *
- * @typedef PointLike
- * @property {number | null | undefined} [line]
- * @property {number | null | undefined} [column]
- * @property {number | null | undefined} [offset]
- *
- * @typedef PositionLike
- * @property {PointLike | null | undefined} [start]
- * @property {PointLike | null | undefined} [end]
- */
-/**
- * Serialize the positional info of a point, position (start and end points),
- * or node.
- *
- * @param {Node | NodeLike | Point | PointLike | Position | PositionLike | null | undefined} [value]
- *   Node, position, or point.
- * @returns {string}
- *   Pretty printed positional info of a node (`string`).
- *
- *   In the format of a range `ls:cs-le:ce` (when given `node` or `position`)
- *   or a point `l:c` (when given `point`), where `l` stands for line, `c` for
- *   column, `s` for `start`, and `e` for end.
- *   An empty string (`''`) is returned if the given value is neither `node`,
- *   `position`, nor `point`.
- */
-export function stringifyPosition(
-  value?:
-    | Node
-    | NodeLike
-    | Point
-    | PointLike
-    | Position
-    | PositionLike
-    | null
-    | undefined
-): string
-export type Node = import('unist').Node
-export type Point = import('unist').Point
-export type Position = import('unist').Position
-export type NodeLike = {
-  type: string
-  position?: PositionLike | null | undefined
-}
-export type PointLike = {
-  line?: number | null | undefined
-  column?: number | null | undefined
-  offset?: number | null | undefined
-}
-export type PositionLike = {
-  start?: PointLike | null | undefined
-  end?: PointLike | null | undefined
-}