♻️ 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/astro/dist/vite-plugin-scripts/page-ssr.js

@@ -1,36 +0,0 @@
-import MagicString from "magic-string";
-import { normalizePath } from "vite";
-import { isPage } from "../core/util.js";
-import { PAGE_SSR_SCRIPT_ID } from "./index.js";
-function astroScriptsPostPlugin({
-  settings
-}) {
-  return {
-    name: "astro:scripts:page-ssr",
-    enforce: "post",
-    transform(code, id, options) {
-      if (!options?.ssr) return;
-      const hasInjectedScript = settings.scripts.some((s2) => s2.stage === "page-ssr");
-      if (!hasInjectedScript) return;
-      const filename = normalizePath(id);
-      let fileURL;
-      try {
-        fileURL = new URL(`file://${filename}`);
-      } catch {
-        return;
-      }
-      const fileIsPage = isPage(fileURL, settings);
-      if (!fileIsPage) return;
-      const s = new MagicString(code, { filename });
-      s.prepend(`import '${PAGE_SSR_SCRIPT_ID}';
-`);
-      return {
-        code: s.toString(),
-        map: s.generateMap({ hires: "boundary" })
-      };
-    }
-  };
-}
-export {
-  astroScriptsPostPlugin as default
-};