fix: use better-sqlite3 adapter in seed.mjs (Prisma 7 requirement)

prisma/seed.mjs

@@ -1,14 +1,20 @@
 import { PrismaClient } from '@prisma/client'
+import { PrismaBetterSQLite3 } from '@prisma/adapter-better-sqlite3'
+import Database from 'better-sqlite3'
 import { hash } from 'bcryptjs'
 
-const prisma = new PrismaClient()
-
 const password = process.env.SEED_ADMIN_PASSWORD
 if (!password) {
   console.error('SEED_ADMIN_PASSWORD requis')
   process.exit(1)
 }
 
+const dbUrl  = process.env.DATABASE_URL ?? 'file:./data/app.db'
+const dbPath = dbUrl.replace(/^file:/, '')
+const db      = new Database(dbPath)
+const adapter = new PrismaBetterSQLite3(db)
+const prisma  = new PrismaClient({ adapter })
+
 await prisma.user.upsert({
   where: { email: 'mathieu.fort@gmail.com' },
   update: {},
@@ -21,3 +27,4 @@ await prisma.user.upsert({
 })
 console.log('✅ Compte admin créé : mathieu.fort@gmail.com')
 await prisma.$disconnect()
+db.close()