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/pages/notfound.js

@@ -1,4 +1,4 @@
-import { h, PageHeader, Badge, StatusDot, Empty, Card, esc, enc, att_esc, $val, apiFetch, toast, dismissToast, openModal, closeModal, formModal, definePage, hComp, connect, reactive, requestUpdate, Link, createRouter, ToastContainer, render, parseZones } from '/static/hoover/index.js';
+import { h, PageHeader, definePage } from '/static/hoover/index.js?v=6';
 
 export default definePage({
     init() {