♻️ 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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Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/zod/v3/helpers/enumUtil.d.cts

@@ -1,8 +0,0 @@
-export declare namespace enumUtil {
-    type UnionToIntersectionFn<T> = (T extends unknown ? (k: () => T) => void : never) extends (k: infer Intersection) => void ? Intersection : never;
-    type GetUnionLast<T> = UnionToIntersectionFn<T> extends () => infer Last ? Last : never;
-    type UnionToTuple<T, Tuple extends unknown[] = []> = [T] extends [never] ? Tuple : UnionToTuple<Exclude<T, GetUnionLast<T>>, [GetUnionLast<T>, ...Tuple]>;
-    type CastToStringTuple<T> = T extends [string, ...string[]] ? T : never;
-    export type UnionToTupleString<T> = CastToStringTuple<UnionToTuple<T>>;
-    export {};
-}