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/mdast-util-to-markdown/lib/util/format-code-as-indented.d.ts

@@ -0,0 +1,13 @@
+/**
+ * @import {State} from 'mdast-util-to-markdown'
+ * @import {Code} from 'mdast'
+ */
+/**
+ * @param {Code} node
+ * @param {State} state
+ * @returns {boolean}
+ */
+export function formatCodeAsIndented(node: Code, state: State): boolean;
+import type { Code } from 'mdast';
+import type { State } from 'mdast-util-to-markdown';
+//# sourceMappingURL=format-code-as-indented.d.ts.map