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/telemetry/index.d.ts

@@ -0,0 +1,7 @@
+import { type Flags } from '../flags.js';
+interface TelemetryOptions {
+    flags: Flags;
+}
+export declare function notify(): Promise<void>;
+export declare function update(subcommand: string, { flags }: TelemetryOptions): Promise<void>;
+export {};