feat: speed up file uploads (#1121)

prisma/migrations/20260724223042_add_file_user_id_index/migration.sql

@@ -0,0 +1,2 @@
+-- CreateIndex
+CREATE INDEX "File_userId_size_idx" ON "public"."File"("userId", "size");

prisma/schema.prisma

@@ -17,7 +17,7 @@ model Zipline {
 
   coreReturnHttpsUrls Boolean @default(false)
   coreDefaultDomain   String?
-  coreTempDirectory   String // default join(tmpdir(), 'zipline')
+  coreTempDirectory   String // default resolve('./uploads/.tmp')
   coreTrustProxy      Boolean @default(false)
 
   chunksEnabled Boolean @default(true)
@@ -298,6 +298,7 @@ model File {
   thumbnail Thumbnail?
 
   @@index([name])
+  @@index([userId, size])
   @@index([folderId, createdAt])
 }