feat: add admin authentication

apps/api/prisma/seed.ts

@@ -1,4 +1,5 @@
 import { PrismaClient } from "@prisma/client";
+import { hash } from "bcryptjs";
 
 const prisma = new PrismaClient();
 
@@ -54,6 +55,15 @@ async function main(): Promise<void> {
       create: { brandId: brand.id, name, isPreset: true },
     });
   }
+  await prisma.adminUser.upsert({
+    where: { username: "admin" },
+    update: {},
+    create: {
+      username: "admin",
+      passwordHash: await hash(process.env.SEED_ADMIN_PASSWORD ?? "change-me-now-123", 12),
+      displayName: "品牌管理员",
+    },
+  });
 }
 
 main().finally(() => prisma.$disconnect());