feat: add cron cleanup and worker-check scripts

worker/cron-cleanup.ts

@@ -0,0 +1,29 @@
+import 'dotenv/config'
+import { prisma } from '@/lib/prisma'
+import { config } from '../config/app.config'
+import { unlinkSync, existsSync } from 'fs'
+
+async function cleanup() {
+  const cutoff = new Date(
+    Date.now() - config.DOWNLOAD_LINK_TTL_HOURS * 60 * 60 * 1000
+  )
+
+  const expired = await prisma.download.findMany({
+    where: { status: 'DONE', completedAt: { lt: cutoff } },
+    select: { id: true, filePath: true },
+  })
+
+  for (const dl of expired) {
+    if (dl.filePath && existsSync(dl.filePath)) {
+      unlinkSync(dl.filePath)
+    }
+    await prisma.download.update({
+      where: { id: dl.id },
+      data: { status: 'FILE_DELETED', deletedAt: new Date() },
+    })
+  }
+
+  console.log(`[cron-cleanup] removed ${expired.length} expired file(s)`)
+}
+
+cleanup().catch(console.error).finally(() => process.exit(0))