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/components/toast.js

@@ -5,8 +5,8 @@
  * Uses the toast/dismissToast state from api.js.
  */
 
-import { h } from '../vdom.js';
-import { _toasts, dismissToast } from '../api.js';
+import { h } from '../vdom.js?v=6';
+import { _toasts, dismissToast } from '../api.js?v=6';
 
 /**
  * Render all pending toast notifications.