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/astro/dist/core/polyfill.js

@@ -0,0 +1,17 @@
+import buffer from "node:buffer";
+import crypto from "node:crypto";
+function apply() {
+  if (!globalThis.crypto) {
+    Object.defineProperty(globalThis, "crypto", {
+      value: crypto.webcrypto
+    });
+  }
+  if (!globalThis.File) {
+    Object.defineProperty(globalThis, "File", {
+      value: buffer.File
+    });
+  }
+}
+export {
+  apply
+};