feat(tutorials): add video training academy management with YouTube parser and live preview

app/[locale]/admin/settings/actions.ts

@@ -0,0 +1,35 @@
+'use server'
+
+import { revalidatePath } from 'next/cache'
+import { redirect } from 'next/navigation'
+import { auth } from '@/lib/auth'
+import { supabaseAdmin } from '@/lib/supabaseAdmin'
+
+async function requireAdmin() {
+  const session = await auth()
+  if (!session || (session.user as any)?.role !== 'ADMIN') {
+    throw new Error('Yetkisiz erişim')
+  }
+}
+
+export async function updateSettingsAction(formData: FormData) {
+  await requireAdmin()
+
+  const trialDaysRaw = String(formData.get('trial_days') || '').trim()
+  const trialDays = parseInt(trialDaysRaw, 10)
+  if (!trialDaysRaw || isNaN(trialDays) || trialDays < 1) {
+    redirect('/admin/settings?error=' + encodeURIComponent('Deneme süresi 1 veya daha büyük bir tam sayı olmalı'))
+  }
+
+  const { error } = await supabaseAdmin
+    .from('app_settings')
+    .update({ trial_days: trialDays, updated_at: new Date().toISOString() })
+    .eq('id', true)
+
+  if (error) {
+    redirect('/admin/settings?error=' + encodeURIComponent(error.message))
+  }
+
+  revalidatePath('/admin/settings')
+  redirect('/admin/settings?success=1')
+}