♻️ 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/container/vite-plugin-container.js

@@ -1,15 +0,0 @@
-const virtualModuleId = "astro:container";
-function astroContainer() {
-  return {
-    name: "astro:container",
-    enforce: "pre",
-    resolveId(id) {
-      if (id === virtualModuleId) {
-        return this.resolve("astro/virtual-modules/container.js");
-      }
-    }
-  };
-}
-export {
-  astroContainer as default
-};