Refactor Prisma integration and improve project setup

- Move Prisma files to standard /prisma directory
- Remove Turso adapter dependencies for Prisma
- Fix auth configuration in templates
- Update router devtools package name
- Simplify post-installation instructions
- Improve npm scripts with cleaner commands

apps/cli/template/with-prisma-postgres/packages/server/prisma/index.ts

@@ -0,0 +1,5 @@
+import { PrismaClient } from "@prisma/client";
+
+let prisma = new PrismaClient();
+
+export default prisma;