refactor: 重构项目支持TypeORM数据库持久化

新增数据库实体类与服务实现，将内存存储扩展为支持数据库的完整实现，包括：
1. 新增Drama和Episode实体类，添加多个业务字段
2. 重构DramasService实现数据库CRUD与业务逻辑
3. 升级相关服务类为异步方法适配数据库操作
4. 更新测试用例适配异步接口变更
5. 完善分页、数据转换等辅助工具方法

src/modules/media/media.service.ts

@@ -54,8 +54,10 @@ export class MediaService {
     return job;
   }
 
-  createDirectUploadTask(dto: CreateDirectUploadTaskDto): MediaUploadJobRecord {
-    this.dramasService.getEpisodeOrThrow(dto.episodeId);
+  async createDirectUploadTask(
+    dto: CreateDirectUploadTaskDto,
+  ): Promise<MediaUploadJobRecord> {
+    await this.dramasService.getEpisodeOrThrow(dto.episodeId);
     const now = new Date().toISOString();
     const jobId = randomUUID();
     const upload = this.bytePlusMediaProvider.createDirectUpload({
@@ -87,7 +89,7 @@ export class MediaService {
     return job;
   }
 
-  completeDirectUploadTask(jobId: string): MediaUploadJobRecord {
+  async completeDirectUploadTask(jobId: string): Promise<MediaUploadJobRecord> {
     const job = this.getUploadJobOrThrow(jobId);
     if (!job.objectKey || !job.episodeId) {
       throw new NotFoundException('Upload task not found');
@@ -116,7 +118,7 @@ export class MediaService {
       updatedAt: new Date().toISOString(),
     });
 
-    this.dramasService.attachEpisodeMedia({
+    await this.dramasService.attachEpisodeMedia({
       episodeId: job.episodeId,
       byteplusVid: completed.byteplusVid,
       videoUrl: completed.videoUrl,
@@ -132,7 +134,7 @@ export class MediaService {
     return job;
   }
 
-  retryReview(jobId: string): MediaUploadJobRecord {
+  async retryReview(jobId: string): Promise<MediaUploadJobRecord> {
     const job = this.getUploadJobOrThrow(jobId);
     if (!job.byteplusVid || !job.episodeId) {
       throw new NotFoundException('Upload task not found');
@@ -143,7 +145,7 @@ export class MediaService {
     job.reviewStatus = review.reviewStatus;
     job.reviewMessage = review.reviewMessage;
     job.updatedAt = new Date().toISOString();
-    this.dramasService.updateEpisodeReviewStatus(
+    await this.dramasService.updateEpisodeReviewStatus(
       job.episodeId,
       review.reviewStatus,
       review.reviewMessage,
@@ -151,7 +153,7 @@ export class MediaService {
     return job;
   }
 
-  syncReviewStatuses() {
+  async syncReviewStatuses() {
     const reviewingJobs = this.uploadJobs.filter(
       (job) =>
         job.byteplusVid &&
@@ -167,7 +169,7 @@ export class MediaService {
       job.reviewStatus = review.reviewStatus;
       job.reviewMessage = review.reviewMessage;
       job.updatedAt = new Date().toISOString();
-      this.dramasService.updateEpisodeReviewStatus(
+      await this.dramasService.updateEpisodeReviewStatus(
         job.episodeId as number,
         review.reviewStatus,
         review.reviewMessage,