fix(admin): remove revalidatePath to prevent combobox reset after save

revalidatePath was causing the server component to re-render and
potentially remount the client component, resetting all useState values.
Since the client component already updates its local state optimistically
after save, revalidatePath is unnecessary here. Also uninstalls agentation.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

keep-notes/app/actions/admin-settings.ts

@@ -1,6 +1,5 @@
 'use server'
 
-import { revalidatePath } from 'next/cache'
 import prisma from '@/lib/prisma'
 import { auth } from '@/auth'
 import { sendEmail } from '@/lib/mail'
@@ -57,7 +56,6 @@ export async function updateSystemConfig(data: Record<string, string>) {
     )
 
     await prisma.$transaction(operations)
-    revalidatePath('/admin/settings')
     return { success: true }
   } catch (error) {
     console.error('Failed to update settings:', error)