♻️ 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-ssr-manifest/index.js

@@ -1,26 +0,0 @@
-const manifestVirtualModuleId = "astro:ssr-manifest";
-const resolvedManifestVirtualModuleId = "\0" + manifestVirtualModuleId;
-function vitePluginSSRManifest() {
-  return {
-    name: "@astrojs/vite-plugin-astro-ssr-manifest",
-    enforce: "post",
-    resolveId(id) {
-      if (id === manifestVirtualModuleId) {
-        return resolvedManifestVirtualModuleId;
-      }
-    },
-    load(id) {
-      if (id === resolvedManifestVirtualModuleId) {
-        return {
-          code: `export let manifest = {};
-export function _privateSetManifestDontUseThis(ssrManifest) {
-  manifest = ssrManifest;
-}`
-        };
-      }
-    }
-  };
-}
-export {
-  vitePluginSSRManifest
-};