♻️ 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/oniguruma-to-es/dist/esm/index.d.ts

@@ -1,64 +0,0 @@
-export type ToRegExpOptions = {
-    accuracy?: "default" | "strict";
-    avoidSubclass?: boolean;
-    flags?: string;
-    global?: boolean;
-    hasIndices?: boolean;
-    lazyCompileLength?: number;
-    rules?: {
-        allowOrphanBackrefs?: boolean;
-        asciiWordBoundaries?: boolean;
-        captureGroup?: boolean;
-        recursionLimit?: number;
-        singleline?: boolean;
-    };
-    target?: "auto" | "ES2025" | "ES2024" | "ES2018";
-    verbose?: boolean;
-};
-import { EmulatedRegExp } from './subclass.js';
-/**
-@import {EmulatedRegExpOptions} from './subclass.js';
-*/
-/**
-@typedef {{
-  accuracy?: keyof Accuracy;
-  avoidSubclass?: boolean;
-  flags?: string;
-  global?: boolean;
-  hasIndices?: boolean;
-  lazyCompileLength?: number;
-  rules?: {
-    allowOrphanBackrefs?: boolean;
-    asciiWordBoundaries?: boolean;
-    captureGroup?: boolean;
-    recursionLimit?: number;
-    singleline?: boolean;
-  };
-  target?: keyof Target;
-  verbose?: boolean;
-}} ToRegExpOptions
-*/
-/**
-Accepts an Oniguruma pattern and returns an equivalent JavaScript `RegExp`.
-@param {string} pattern Oniguruma regex pattern.
-@param {ToRegExpOptions} [options]
-@returns {RegExp | EmulatedRegExp}
-*/
-export function toRegExp(pattern: string, options?: ToRegExpOptions): RegExp | EmulatedRegExp;
-/**
-Accepts an Oniguruma pattern and returns the details for an equivalent JavaScript `RegExp`.
-@param {string} pattern Oniguruma regex pattern.
-@param {ToRegExpOptions} [options]
-@returns {{
-  pattern: string;
-  flags: string;
-  options?: EmulatedRegExpOptions;
-}}
-*/
-export function toRegExpDetails(pattern: string, options?: ToRegExpOptions): {
-    pattern: string;
-    flags: string;
-    options?: EmulatedRegExpOptions;
-};
-import type { EmulatedRegExpOptions } from './subclass.js';
-export { EmulatedRegExp };