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/cli/infra/cli-command-runner.d.ts

@@ -0,0 +1,9 @@
+import type { CommandRunner, HelpDisplay } from '../definitions.js';
+import type { AnyCommand } from '../domain/command.js';
+export declare class CliCommandRunner implements CommandRunner {
+    #private;
+    constructor({ helpDisplay, }: {
+        helpDisplay: HelpDisplay;
+    });
+    run<T extends AnyCommand>(command: T, ...args: Parameters<T['run']>): ReturnType<T['run']> | undefined;
+}