feat: implement file deletion functionality and enhance deployment script

frontend/app/api/files/[token]/route.ts

@@ -1,5 +1,6 @@
 import { NextResponse } from 'next/server'
-import { getFile } from '@/lib/store'
+import { getFile, deleteFile } from '@/lib/store'
+import { getSession } from '@/lib/session'
 
 export async function GET(
   _request: Request,
@@ -12,3 +13,21 @@ export async function GET(
   }
   return NextResponse.json(record)
 }
+
+export async function DELETE(
+  _request: Request,
+  { params }: { params: Promise<{ token: string }> },
+) {
+  const session = await getSession()
+  if (!session || session.role !== 'admin') {
+    return NextResponse.json({ error: 'Forbidden' }, { status: 403 })
+  }
+
+  const { token } = await params
+  try {
+    await deleteFile(token)
+    return NextResponse.json({ ok: true })
+  } catch (e) {
+    return NextResponse.json({ error: (e as Error).message }, { status: 404 })
+  }
+}