updated bucket settings page

prisma/migrations/20260625100000_add_system_config/migration.sql

@@ -0,0 +1,8 @@
+-- CreateTable
+CREATE TABLE "system_config" (
+    "key" TEXT NOT NULL,
+    "value" TEXT NOT NULL,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "system_config_pkey" PRIMARY KEY ("key")
+);

prisma/schema.prisma

@@ -546,3 +546,12 @@ model ReviewSession {
 
   @@map("review_sessions")
 }
+
+/// Key-value store for system-wide configuration (e.g. storage credentials)
+model SystemConfig {
+  key       String   @id
+  value     String   @db.Text
+  updatedAt DateTime @updatedAt
+
+  @@map("system_config")
+}