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/domain/help-payload.d.ts

@@ -0,0 +1,7 @@
+export interface HelpPayload {
+    commandName: string;
+    headline?: string;
+    usage?: string;
+    tables?: Record<string, [command: string, help: string][]>;
+    description?: string;
+}