chore(server): add ai document link on admin panel (#13428)

close AF-2766
<img width="2082" height="654" alt="image"
src="https://github.com/user-attachments/assets/efba776c-91cd-4d59-a2a6-e00f68c61be1"
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#### PR Dependency Tree


* **PR #13428** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **New Features**
* Configuration descriptions for the copilot plugin now include direct
links to relevant documentation for easier access to more information.

* **Style**
* Improved display of configuration descriptions to support and render
HTML content.

* **Refactor**
* The AI navigation item in the admin panel has been disabled and is no
longer visible.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/admin/src/modules/nav/nav.tsx

@@ -1,6 +1,6 @@
 import { buttonVariants } from '@affine/admin/components/ui/button';
 import { cn } from '@affine/admin/utils';
-import { AccountIcon, AiOutlineIcon, SelfhostIcon } from '@blocksuite/icons/rc';
+import { AccountIcon, SelfhostIcon } from '@blocksuite/icons/rc';
 import { cssVarV2 } from '@toeverything/theme/v2';
 import { NavLink } from 'react-router-dom';
 
@@ -90,12 +90,12 @@ export function Nav({ isCollapsed = false }: NavProps) {
           label="Accounts"
           isCollapsed={isCollapsed}
         />
-        <NavItem
+        {/* <NavItem
           to="/admin/ai"
           icon={<AiOutlineIcon fontSize={20} />}
           label="AI"
           isCollapsed={isCollapsed}
-        />
+        /> */}
         <SettingsItem isCollapsed={isCollapsed} />
         <NavItem
           to="/admin/about"