feat: add API endpoints for Debian and Ubuntu package syncing

- Implemented /api/sync-debian and /api/sync-ubuntu routes with authentication and status tracking
- Added GET endpoints to check sync status and POST endpoints to trigger package fetches
- Included concurrent sync prevention and async error handling for long-running operations

src/app/api/sync-debian/route.ts

@@ -0,0 +1,50 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { DebianPackageFetcher } from '@/services/debianPackageFetcher'
+import { SyncAuth } from '@/lib/sync/auth'
+
+export const dynamic = 'force-dynamic'
+export const maxDuration = 300
+
+let syncInProgress = false
+let syncStatus = {
+  status: 'idle' as 'idle' | 'running' | 'complete' | 'error',
+  error: null as string | null
+}
+
+export async function GET() {
+  return NextResponse.json(syncStatus)
+}
+
+export async function POST(request: NextRequest) {
+  const authResult = await SyncAuth.isSyncAllowed(request)
+  if (!authResult.allowed) {
+    return NextResponse.json(
+      { error: 'Sync operation not allowed', reason: authResult.reason },
+      { status: 403 }
+    )
+  }
+
+  if (syncInProgress) {
+    return NextResponse.json(
+      { error: 'Sync already in progress' },
+      { status: 409 }
+    )
+  }
+
+  syncInProgress = true
+  syncStatus = { status: 'running', error: null }
+
+  ;(async () => {
+    try {
+      await DebianPackageFetcher.fetchDebianPackages()
+      syncStatus.status = 'complete'
+    } catch (error) {
+      syncStatus.status = 'error'
+      syncStatus.error = error instanceof Error ? error.message : 'Unknown error'
+    } finally {
+      syncInProgress = false
+    }
+  })()
+
+  return NextResponse.json({ message: 'Debian packages sync started', status: syncStatus })
+}