♻️ 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/runtime/server/util.js

@@ -1,19 +0,0 @@
-function isPromise(value) {
-  return !!value && typeof value === "object" && "then" in value && typeof value.then === "function";
-}
-async function* streamAsyncIterator(stream) {
-  const reader = stream.getReader();
-  try {
-    while (true) {
-      const { done, value } = await reader.read();
-      if (done) return;
-      yield value;
-    }
-  } finally {
-    reader.releaseLock();
-  }
-}
-export {
-  isPromise,
-  streamAsyncIterator
-};