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/stringify-entities/lib/util/to-named.d.ts

@@ -0,0 +1,10 @@
+/**
+ * Configurable ways to encode characters as named references.
+ *
+ * @param {number} code
+ * @param {number} next
+ * @param {boolean|undefined} omit
+ * @param {boolean|undefined} attribute
+ * @returns {string}
+ */
+export function toNamed(code: number, next: number, omit: boolean | undefined, attribute: boolean | undefined): string;