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/ccount/index.d.ts

@@ -0,0 +1,11 @@
+/**
+ * Count how often a character (or substring) is used in a string.
+ *
+ * @param {string} value
+ *   Value to search in.
+ * @param {string} character
+ *   Character (or substring) to look for.
+ * @return {number}
+ *   Number of times `character` occurred in `value`.
+ */
+export function ccount(value: string, character: string): number