fix: use BetterAuth's hashPassword for seed

src/db/seed.ts

@@ -1,14 +1,7 @@
 import { db } from './index';
 import { users, accounts } from './schema';
 import { eq } from 'drizzle-orm';
-
-// Hash password using the same method as BetterAuth (bcrypt via Bun)
-async function hashPassword(password: string): Promise<string> {
-  return await Bun.password.hash(password, {
-    algorithm: 'bcrypt',
-    cost: 10,
-  });
-}
+import { hashPassword } from 'better-auth/crypto';
 
 async function seed() {
   const testEmail = 'test@test.com';