chore: add schema fix script for deployment

fix-schema.js

@@ -0,0 +1,5 @@
+const { PrismaClient } = require("@prisma/client");
+const p = new PrismaClient();
+p.$executeRawUnsafe("ALTER TABLE users ALTER COLUMN \"tenantId\" DROP NOT NULL")
+  .then(() => { console.log("tenantId nullable OK"); return p.$disconnect(); })
+  .catch(e => { console.log("Error:", e.message.substring(0, 100)); return p.$disconnect(); });