♻️ 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
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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/utils.d.ts

@@ -1,23 +0,0 @@
-export const cp: (...codePoints: number[]) => string;
-export namespace envFlags {
-    let bugFlagVLiteralHyphenIsRange: boolean;
-    let bugNestedClassIgnoresNegation: boolean;
-}
-export function getNewCurrentFlags(current: any, { enable, disable }: {
-    enable: any;
-    disable: any;
-}): {
-    dotAll: boolean;
-    ignoreCase: boolean;
-};
-export function getOrInsert(map: any, key: any, defaultValue: any): any;
-/**
-@param {keyof Target} target
-@param {keyof Target} min
-@returns {boolean}
-*/
-export function isMinTarget(target: "auto" | "ES2025" | "ES2024" | "ES2018", min: "auto" | "ES2025" | "ES2024" | "ES2018"): boolean;
-export const r: (template: {
-    raw: readonly string[] | ArrayLike<string>;
-}, ...substitutions: any[]) => string;
-export function throwIfNullish(value: any, msg: any): any;