feat(sync): add customer synchronization from lic server

shop/app/api/cron/sync-customers/route.ts

@@ -0,0 +1,25 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { syncCustomersFromLicServer } from '@/lib/actions/companies'
+
+export const dynamic = 'force-dynamic'
+
+export async function GET(req: NextRequest) {
+  // Check authorization header
+  const authHeader = req.headers.get('authorization')
+  const cronSecret = process.env.CRON_SECRET
+
+  // Secure the cron endpoint in production
+  if (process.env.NODE_ENV === 'production' && cronSecret) {
+    if (authHeader !== `Bearer ${cronSecret}`) {
+      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+    }
+  }
+
+  try {
+    const res = await syncCustomersFromLicServer()
+    return NextResponse.json({ success: true, count: res.count })
+  } catch (err: any) {
+    console.error('[cron] Customer sync failed:', err)
+    return NextResponse.json({ error: err.message || 'Sync failed' }, { status: 500 })
+  }
+}