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/actions/vite-plugin-actions.d.ts

@@ -0,0 +1,15 @@
+import type fsMod from 'node:fs';
+import type { Plugin as VitePlugin } from 'vite';
+import type { BuildInternals } from '../core/build/internal.js';
+import type { StaticBuildOptions } from '../core/build/types.js';
+import type { AstroSettings } from '../types/astro.js';
+/**
+ * This plugin is used to retrieve the final entry point of the bundled actions.ts file
+ * @param opts
+ * @param internals
+ */
+export declare function vitePluginActionsBuild(opts: StaticBuildOptions, internals: BuildInternals): VitePlugin;
+export declare function vitePluginActions({ fs, settings, }: {
+    fs: typeof fsMod;
+    settings: AstroSettings;
+}): VitePlugin;