fix: auth otp flow + remove generated

prisma/migrations/20260405095542_add_otp_model/migration.sql

@@ -0,0 +1,9 @@
+-- CreateTable
+CREATE TABLE "user_otp" (
+    "email" TEXT NOT NULL,
+    "otp" INTEGER NOT NULL,
+    "generatedOn" TIMESTAMP(3) NOT NULL
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "user_otp_email_key" ON "user_otp"("email");