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

src/modules/database/database.module.ts

@@ -3,6 +3,9 @@ import { TypeOrmModule } from '@nestjs/typeorm';
 import { AdminUser } from '../admin/entities/admin-user.entity';
 import { Permission } from '../admin/entities/permission.entity';
 import { Role } from '../admin/entities/role.entity';
+import { DataSyncJob } from '../data/entities/data-sync-job.entity';
+import { DramaMetric } from '../data/entities/drama-metric.entity';
+import { EpisodeMetric } from '../data/entities/episode-metric.entity';
 import { Drama } from '../dramas/entities/drama.entity';
 import { Episode } from '../dramas/entities/episode.entity';
 import { PlaybackErrorLog } from '../logs/entities/playback-error-log.entity';
@@ -25,6 +28,9 @@ const databaseImports = process.env.DB_HOST
           AdminUser,
           Permission,
           Role,
+          DataSyncJob,
+          DramaMetric,
+          EpisodeMetric,
           Drama,
           Episode,
           PlaybackErrorLog,