feat(admin): add prompt management page (#7611)

close AF-907

Supports online modification of prompt, but does not support custom ai key yet

![CleanShot 2024-07-29 at 22 12 39@2x](https://github.com/user-attachments/assets/c67ad0d0-3e5b-44ff-b7db-d07dd11c19e2)

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

@@ -7,12 +7,7 @@ import {
 import { buttonVariants } from '@affine/admin/components/ui/button';
 import { cn } from '@affine/admin/utils';
 import * as ScrollAreaPrimitive from '@radix-ui/react-scroll-area';
-import {
-  ClipboardListIcon,
-  CpuIcon,
-  SettingsIcon,
-  UsersIcon,
-} from 'lucide-react';
+import { ClipboardListIcon, SettingsIcon, UsersIcon } from 'lucide-react';
 import { useEffect } from 'react';
 import { Link } from 'react-router-dom';
 
@@ -28,8 +23,6 @@ const TabsMap: { [key: string]: string } = {
   settings: 'Settings',
 };
 
-const defaultTab = 'Accounts';
-
 export function Nav() {
   const { moduleList } = useGetServerRuntimeConfig();
   const { activeTab, setActiveTab, setCurrentModule } = useNav();
@@ -42,7 +35,6 @@ export function Nav() {
         return;
       }
     }
-    setActiveTab(defaultTab);
   }, [setActiveTab]);
 
   return (
@@ -64,7 +56,8 @@ export function Nav() {
           <UsersIcon className="mr-2 h-4 w-4" />
           Accounts
         </Link>
-        <Link
+        {/* hide ai config in admin until it's ready */}
+        {/* <Link
           to={'/admin/ai'}
           className={cn(
             buttonVariants({
@@ -79,7 +72,7 @@ export function Nav() {
         >
           <CpuIcon className="mr-2 h-4 w-4" />
           AI
-        </Link>
+        </Link> */}
         <Link
           to={'/admin/config'}
           className={cn(