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/assets/utils/proxy.js

@@ -0,0 +1,20 @@
+function getProxyCode(options, isSSR) {
+  const stringifiedFSPath = JSON.stringify(options.fsPath);
+  return `
+						new Proxy(${JSON.stringify(options)}, {
+						get(target, name, receiver) {
+							if (name === 'clone') {
+								return structuredClone(target);
+							}
+							if (name === 'fsPath') {
+								return ${stringifiedFSPath};
+							}
+							${!isSSR ? `if (target[name] !== undefined && globalThis.astroAsset) globalThis.astroAsset?.referencedImages.add(${stringifiedFSPath});` : ""}
+							return target[name];
+						}
+					})
+					`;
+}
+export {
+  getProxyCode
+};