♻️ 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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✅ 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/vite-plugin-fileurl/index.js

@@ -1,15 +0,0 @@
-function vitePluginFileURL() {
-  return {
-    name: "astro:vite-plugin-file-url",
-    enforce: "pre",
-    resolveId(source, importer) {
-      if (source.startsWith("file://")) {
-        const rest = source.slice(7);
-        return this.resolve(rest, importer);
-      }
-    }
-  };
-}
-export {
-  vitePluginFileURL as default
-};