enh: system prompt user permission

src/lib/components/admin/Users/Groups/Permissions.svelte

@@ -263,6 +263,14 @@
 			<Switch bind:state={permissions.chat.controls} />
 		</div>
 
+		<div class="  flex w-full justify-between my-2 pr-2">
+			<div class=" self-center text-xs font-medium">
+				{$i18n.t('Allow Chat System Prompt')}
+			</div>
+
+			<Switch bind:state={permissions.chat.system_prompt} />
+		</div>
+
 		<div class="  flex w-full justify-between my-2 pr-2">
 			<div class=" self-center text-xs font-medium">
 				{$i18n.t('Allow Chat Delete')}