feat: add Config schema

web/prisma/migrations/20260710174553_add_config/migration.sql

@@ -0,0 +1,9 @@
+-- CreateTable
+CREATE TABLE "Config" (
+    "key" TEXT NOT NULL,
+    "value" TEXT NOT NULL,
+    "secret" BOOLEAN NOT NULL DEFAULT false,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "Config_pkey" PRIMARY KEY ("key")
+);

web/prisma/schema.prisma

@@ -75,3 +75,10 @@ model LibraryItem {
 
   @@unique([artist, album])
 }
+
+model Config {
+  key       String   @id
+  value     String
+  secret    Boolean  @default(false)
+  updatedAt DateTime @updatedAt
+}