refactor: modernize frontend with hoover framework components and docs

- Add quick modal, table, service status, and confirmation dialog components
- Refactor all pages (certs, dhcp, proxy, etc.) to use new component patterns
- Introduce refactor load utility and render guard for consistent UX
- Add hoover documentation and update AGENTS.md, architecture, overview

webui/static/hoover/router.js

@@ -5,8 +5,8 @@
  * navigation).  Link component for client-side navigation.
  */
 
-import { reactive } from './reactivity.js';
-import { h } from './vdom.js';
+import { reactive } from './reactivity.js?v=6';
+import { h } from './vdom.js?v=6';
 
 /**
  * Hash-based router.