game systems: game system pages, game system create

components: moved DevTool to client component

prisma/prismaClient.ts

@@ -0,0 +1,13 @@
+import { PrismaClient } from "@prisma/client";
+
+const prismaClientSingleton = () => {
+  return new PrismaClient();
+};
+
+declare global {
+  var prismaGlobal: undefined | ReturnType<typeof prismaClientSingleton>;
+}
+
+export const prisma = globalThis.prismaGlobal ?? prismaClientSingleton();
+
+if (process.env.NODE_ENV !== "production") globalThis.prismaGlobal = prisma;