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/create-vite.d.ts

@@ -0,0 +1,23 @@
+import nodeFs from 'node:fs';
+import * as vite from 'vite';
+import type { AstroSettings, RoutesList } from '../types/astro.js';
+import type { SSRManifest } from './app/types.js';
+import type { Logger } from './logger/core.js';
+type CreateViteOptions = {
+    settings: AstroSettings;
+    logger: Logger;
+    mode: string;
+    fs?: typeof nodeFs;
+    sync: boolean;
+    routesList: RoutesList;
+    manifest: SSRManifest;
+} & ({
+    command: 'dev';
+    manifest: SSRManifest;
+} | {
+    command: 'build';
+    manifest?: SSRManifest;
+});
+/** Return a base vite config as a common starting point for all Vite commands. */
+export declare function createVite(commandConfig: vite.InlineConfig, { settings, logger, mode, command, fs, sync, routesList, manifest }: CreateViteOptions): Promise<vite.InlineConfig>;
+export {};