fix: seed에서 argon2 런타임 의존성 제거 (Docker Alpine 호환)

packages/database/seeds/seed.ts

@@ -2,7 +2,9 @@ import { PrismaClient } from '@prisma/client';
 import { readFileSync } from 'node:fs';
 import { resolve, dirname } from 'node:path';
 import { fileURLToPath } from 'node:url';
-import argon2 from 'argon2';
+// Pre-generated argon2 hash for admin password (avoids native compilation dependency in Docker Alpine)
+const ADMIN_PASSWORD_HASH =
+  '$argon2id$v=19$m=65536,t=3,p=4$MMkWVs1hKzKPp5P93KLITw$fhiUqTZMkR0ucwQNteHskMn9UIrD/7aUXZPUdzWYloE';
 
 const __dirname = dirname(fileURLToPath(import.meta.url));
 
@@ -152,7 +154,7 @@ async function seedAdminUser(): Promise<void> {
     return;
   }
 
-  const passwordHash = await argon2.hash('admin123');
+  const passwordHash = ADMIN_PASSWORD_HASH;
 
   const user = await prisma.user.create({
     data: {