feat: 新增数据库持久化支持并完善后台管理功能

- 引入dotenv加载环境变量，新增数据库同步配置项
- 为用户服务、管理员服务、数据服务添加数据库持久化逻辑
- 新增管理员用户邮箱字段，完善权限校验逻辑
- 添加数据库初始化与种子数据脚本
- 新增e2e测试验证管理员数据持久化

test/database-persistence.e2e-spec.ts

@@ -1,3 +1,4 @@
+import { AdminService } from '../src/modules/admin/admin.service';
 import { DataService } from '../src/modules/data/data.service';
 import { TikTokDataProvider } from '../src/modules/data/providers/tiktok-data.provider';
 import { PublishStatus } from '../src/modules/dramas/drama-status.enum';
@@ -48,6 +49,48 @@ function createDataSource(repositories: Record<string, unknown>) {
 }
 
 describe('database-backed persistence', () => {
+  it('persists permissions and admin profile changes through TypeORM repositories', async () => {
+    const permissionRepository = createRepository();
+    const roleRepository = createRepository();
+    const adminUserRepository = createRepository();
+    const dataSource = createDataSource({
+      Permission: permissionRepository,
+      Role: roleRepository,
+      AdminUser: adminUserRepository,
+    });
+    const service = new AdminService(
+      { signAsync: jest.fn() } as never,
+      dataSource as never,
+    );
+
+    await service.onModuleInit();
+
+    const permissions = await service.listPermissions({ page: 1, pageSize: 50 });
+    expect(permissions.list).toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({ code: 'permission:read', name: '查看权限' }),
+        expect.objectContaining({ code: 'data:read', name: '查看数据' }),
+      ]),
+    );
+
+    const updated = await service.updateProfile(1, {
+      nickname: '数据库管理员',
+      email: 'db-admin@example.com',
+    });
+
+    expect(updated).toMatchObject({
+      id: 1,
+      nickname: '数据库管理员',
+      email: 'db-admin@example.com',
+    });
+    expect(adminUserRepository.save).toHaveBeenCalledWith(
+      expect.objectContaining({
+        nickname: '数据库管理员',
+        email: 'db-admin@example.com',
+      }),
+    );
+  });
+
   it('persists app users through TypeORM repositories when a DataSource is configured', async () => {
     const userRepository = createRepository();
     const dataSource = createDataSource({ User: userRepository });