♻️ 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/zod-to-json-schema/dist/esm/errorMessages.js

@@ -1,14 +0,0 @@
-export function addErrorMessage(res, key, errorMessage, refs) {
-    if (!refs?.errorMessages)
-        return;
-    if (errorMessage) {
-        res.errorMessage = {
-            ...res.errorMessage,
-            [key]: errorMessage,
-        };
-    }
-}
-export function setResponseValueAndErrors(res, key, value, errorMessage, refs) {
-    res[key] = value;
-    addErrorMessage(res, key, errorMessage, refs);
-}