♻️ 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
✅ Cookie consent banner included
✅ 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/postcss/lib/previous-map.d.ts

@@ -1,81 +0,0 @@
-import { SourceMapConsumer } from 'source-map-js'
-
-import { ProcessOptions } from './postcss.js'
-
-declare namespace PreviousMap {
-  // eslint-disable-next-line @typescript-eslint/no-use-before-define
-  export { PreviousMap_ as default }
-}
-
-/**
- * Source map information from input CSS.
- * For example, source map after Sass compiler.
- *
- * This class will automatically find source map in input CSS or in file system
- * near input file (according `from` option).
- *
- * ```js
- * const root = parse(css, { from: 'a.sass.css' })
- * root.input.map //=> PreviousMap
- * ```
- */
-declare class PreviousMap_ {
-  /**
-   * `sourceMappingURL` content.
-   */
-  annotation?: string
-
-  /**
-   * The CSS source identifier. Contains `Input#file` if the user
-   * set the `from` option, or `Input#id` if they did not.
-   */
-  file?: string
-
-  /**
-   * Was source map inlined by data-uri to input CSS.
-   */
-  inline: boolean
-
-  /**
-   * Path to source map file.
-   */
-  mapFile?: string
-
-  /**
-   * The directory with source map file, if source map is in separated file.
-   */
-  root?: string
-
-  /**
-   * Source map file content.
-   */
-  text?: string
-
-  /**
-   * @param css  Input CSS source.
-   * @param opts Process options.
-   */
-  constructor(css: string, opts?: ProcessOptions)
-
-  /**
-   * Create a instance of `SourceMapGenerator` class
-   * from the `source-map` library to work with source map information.
-   *
-   * It is lazy method, so it will create object only on first call
-   * and then it will use cache.
-   *
-   * @return Object with source map information.
-   */
-  consumer(): SourceMapConsumer
-
-  /**
-   * Does source map contains `sourcesContent` with input source text.
-   *
-   * @return Is `sourcesContent` present.
-   */
-  withContent(): boolean
-}
-
-declare class PreviousMap extends PreviousMap_ {}
-
-export = PreviousMap