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/build/remote.d.ts

@@ -0,0 +1,30 @@
+export type RemoteCacheEntry = {
+    data?: string;
+    expires: number;
+    etag?: string;
+    lastModified?: string;
+};
+export declare function loadRemoteImage(src: string): Promise<{
+    data: Buffer<ArrayBuffer>;
+    expires: number;
+    etag: string | undefined;
+    lastModified: string | undefined;
+}>;
+/**
+ * Revalidate a cached remote asset using its entity-tag or modified date.
+ * Uses the [If-None-Match](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-None-Match) and [If-Modified-Since](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-Modified-Since)
+ * headers to check with the remote server if the cached version of a remote asset is still up to date.
+ * The remote server may respond that the cached asset is still up-to-date if the entity-tag or modification time matches (304 Not Modified), or respond with an updated asset (200 OK)
+ * @param src - url to remote asset
+ * @param revalidationData - an object containing the stored Entity-Tag of the cached asset and/or the Last Modified time
+ * @returns An ImageData object containing the asset data, a new expiry time, and the asset's etag. The data buffer will be empty if the asset was not modified.
+ */
+export declare function revalidateRemoteImage(src: string, revalidationData: {
+    etag?: string;
+    lastModified?: string;
+}): Promise<{
+    data: Buffer<ArrayBuffer>;
+    expires: number;
+    etag: string | undefined;
+    lastModified: string | undefined;
+}>;