refactor: Move Astro to root, use PORT env (default 80), allow all hosts

- Move Astro files from dealplustech-astro/ to project root
- Update Dockerfile: PORT environment variable (default 80)
- Add vite.config.ts with allowedHosts: true
- Matches nixpacks behavior for Easypanel deployment
- No hardcoded ports or domains

node_modules/diff/libesm/util/array.js

@@ -0,0 +1,17 @@
+export function arrayEqual(a, b) {
+    if (a.length !== b.length) {
+        return false;
+    }
+    return arrayStartsWith(a, b);
+}
+export function arrayStartsWith(array, start) {
+    if (start.length > array.length) {
+        return false;
+    }
+    for (let i = 0; i < start.length; i++) {
+        if (start[i] !== array[i]) {
+            return false;
+        }
+    }
+    return true;
+}