♻️ 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/regex/dist/cjs/subclass.d.ts

@@ -1,31 +0,0 @@
-/**
-Works the same as JavaScript's native `RegExp` constructor in all contexts, but automatically
-adjusts subpattern matches and indices (with flag `d`) to account for captures added as part of
-emulating extended syntax.
-*/
-export class RegExpSubclass extends RegExp {
-    /**
-     @overload
-     @param {string} expression
-     @param {string} [flags]
-     @param {{
-     hiddenCaptures?: Array<number>;
-     }} [options]
-     */
-    constructor(expression: string, flags?: string, options?: {
-        hiddenCaptures?: Array<number>;
-    });
-    /**
-     @overload
-     @param {RegExpSubclass} expression
-     @param {string} [flags]
-     */
-    constructor(expression: RegExpSubclass, flags?: string);
-    /**
-    @private
-    @type {Map<number, {
-      hidden: true;
-    }>}
-    */
-    private _captureMap;
-}