Remove query-string cache-busting from static assets

Drop ?v=N version pins from all JS imports and HTML <link>/<script> tags.
Cache invalidation is now handled solely by server-side cache-control headers.
Update docs and AGENTS.md accordingly.

webui/static/hoover/components/layout.js

@@ -4,9 +4,9 @@
  * Layout components: PageHeader, Tabs, SectionTitle, DataTableSection, ActionGroup.
  */
 
-import { h } from '../vdom.js?v=9';
-import { Table } from './data.js?v=9';
-import { collectLoadingModels } from '../model.js?v=9';
+import { h } from '../vdom.js';
+import { Table } from './data.js';
+import { collectLoadingModels } from '../model.js';
 
 /**
  * Page header with title, optional subtitle, and action buttons.