Fix seed.ts import and exclude prisma dir from Next.js tsc

- seed.ts: use ../src/generated/prisma/client (Prisma 7 entry point)
- tsconfig.json: exclude prisma/ so seed.ts is not type-checked by Next.js build

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

prisma/seed.ts

@@ -1,5 +1,5 @@
 import "dotenv/config";
-import { PrismaClient } from "../src/generated/prisma";
+import { PrismaClient } from "../src/generated/prisma/client";
 import bcrypt from "bcryptjs";
 
 const prisma = new PrismaClient();

tsconfig.json

@@ -30,5 +30,5 @@
     ".next/dev/types/**/*.ts",
     "**/*.mts"
   ],
-  "exclude": ["node_modules"]
+  "exclude": ["node_modules", "prisma"]
 }