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/assets/utils/svg.d.ts

@@ -0,0 +1,3 @@
+import type { AstroConfig } from '../../types/public/config.js';
+import type { ImageMetadata } from '../types.js';
+export declare function makeSvgComponent(meta: ImageMetadata, contents: Buffer | string, svgoConfig: AstroConfig['experimental']['svgo']): string;