fix(prisma): update seed script in package.json and prisma.config.ts for consistency

apps/backend/package.json

@@ -9,7 +9,7 @@
     "prisma:migrate": "prisma migrate dev",
     "prisma:studio": "prisma studio",
     "prisma:migrate:deploy": "prisma migrate deploy",
-    "prisma:seed": "bun prisma db seed"
+    "prisma:seed": "bun run prisma/seed.ts"
   },
   "dependencies": {
     "better-auth": "^1.6.11",

apps/backend/prisma.config.ts

@@ -7,6 +7,7 @@ export default defineConfig({
   schema: "prisma/schema.prisma",
   migrations: {
     path: "prisma/migrations",
+    seed: "bun ./prisma/seed.ts",
   },
   datasource: {
     url: process.env["DATABASE_URL"],