♻️ 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/astro/dist/env/errors.js

@@ -1,16 +0,0 @@
-function invalidVariablesToError(invalid) {
-  const _errors = [];
-  for (const { key, type, errors } of invalid) {
-    if (errors[0] === "missing") {
-      _errors.push(`${key} is missing`);
-    } else if (errors[0] === "type") {
-      _errors.push(`${key}'s type is invalid, expected: ${type}`);
-    } else {
-      _errors.push(`The following constraints for ${key} are not met: ${errors.join(", ")}`);
-    }
-  }
-  return _errors;
-}
-export {
-  invalidVariablesToError
-};