feat: 新增剧集封面、集数管理与上传优化功能

1. 新增Cover实体类并注册到数据库模块
2. 为剧集添加总集数字段及自动创建集数槽功能
3. 新增管理员更新剧集集数接口
4. 优化发布剧集列表：支持标题过滤与默认分页大小10
5. 扩展MediaUploadJob实体字段，完善媒体上传流程
6. 重构订单与媒体服务，新增数据库持久化支持
7. 新增剧集标题过滤的端到端测试用例

test/dramas.e2e-spec.ts

@@ -122,6 +122,89 @@ describe('Dramas and episodes', () => {
     });
   });
 
+  it('creates episode slots when a new drama declares total episodes', async () => {
+    const drama = await request(app.getHttpServer())
+      .post('/api/admin/v1/dramas')
+      .set('Authorization', `Bearer ${adminToken}`)
+      .send({
+        title: 'Preconfigured Slots Drama',
+        coverUrl: 'https://cdn.example.com/preconfigured-slots.jpg',
+        type: 'romance',
+        status: 'draft',
+        totalEpisodes: 2,
+      })
+      .expect(201);
+
+    expect(drama.body.data).toMatchObject({
+      title: 'Preconfigured Slots Drama',
+      totalEpisodes: 2,
+      publishedEpisodes: 0,
+    });
+
+    const episodes = await request(app.getHttpServer())
+      .get(`/api/admin/v1/dramas/${drama.body.data.id}/episodes`)
+      .set('Authorization', `Bearer ${adminToken}`)
+      .expect(200);
+
+    expect(episodes.body.data.list).toEqual([
+      expect.objectContaining({
+        dramaId: drama.body.data.id,
+        episodeNo: 1,
+        title: '第1集',
+        publishStatus: 'draft',
+      }),
+      expect.objectContaining({
+        dramaId: drama.body.data.id,
+        episodeNo: 2,
+        title: '第2集',
+        publishStatus: 'draft',
+      }),
+    ]);
+  });
+
+  it('updates an episode from the drama detail episodes endpoint', async () => {
+    const drama = await request(app.getHttpServer())
+      .post('/api/admin/v1/dramas')
+      .set('Authorization', `Bearer ${adminToken}`)
+      .send({
+        title: 'Nested Episode Update Drama',
+        coverUrl: 'https://cdn.example.com/nested-update.jpg',
+        type: 'action',
+        status: 'draft',
+        totalEpisodes: 1,
+      })
+      .expect(201);
+
+    const episodes = await request(app.getHttpServer())
+      .get(`/api/admin/v1/dramas/${drama.body.data.id}/episodes`)
+      .set('Authorization', `Bearer ${adminToken}`)
+      .expect(200);
+    const episodeId = episodes.body.data.list[0].id;
+
+    const updated = await request(app.getHttpServer())
+      .patch(`/api/admin/v1/dramas/${drama.body.data.id}/episodes/${episodeId}`)
+      .set('Authorization', `Bearer ${adminToken}`)
+      .send({
+        title: 'Updated Nested Episode',
+        description: 'Updated from drama detail.',
+        durationSeconds: 240,
+        freeType: 'paid',
+        price: 199,
+      })
+      .expect(200);
+
+    expect(updated.body.data).toMatchObject({
+      id: episodeId,
+      dramaId: drama.body.data.id,
+      title: 'Updated Nested Episode',
+      description: 'Updated from drama detail.',
+      durationSeconds: 240,
+      freeType: 'paid',
+      isPaid: true,
+      price: 199,
+    });
+  });
+
   it('returns only published dramas and published episodes to app APIs', async () => {
     const published = await request(app.getHttpServer())
       .post('/api/admin/v1/dramas')
@@ -197,4 +280,45 @@ describe('Dramas and episodes', () => {
       }),
     ]);
   });
+
+  it('filters published dramas by title and defaults app page size to 10', async () => {
+    await request(app.getHttpServer())
+      .post('/api/admin/v1/dramas')
+      .set('Authorization', `Bearer ${adminToken}`)
+      .send({
+        title: 'Searchable Moon Drama',
+        coverUrl: 'https://cdn.example.com/searchable-moon.jpg',
+        type: 'romance',
+        status: 'published',
+      })
+      .expect(201);
+
+    await request(app.getHttpServer())
+      .post('/api/admin/v1/dramas')
+      .set('Authorization', `Bearer ${adminToken}`)
+      .send({
+        title: 'Hidden Sun Drama',
+        coverUrl: 'https://cdn.example.com/hidden-sun.jpg',
+        type: 'romance',
+        status: 'published',
+      })
+      .expect(201);
+
+    const response = await request(app.getHttpServer())
+      .get('/api/app/v1/dramas')
+      .query({ title: 'Moon' })
+      .expect(200);
+
+    expect(response.body.data.pagination.pageSize).toBe(10);
+    expect(response.body.data.list).toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({ title: 'Searchable Moon Drama' }),
+      ]),
+    );
+    expect(response.body.data.list).not.toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({ title: 'Hidden Sun Drama' }),
+      ]),
+    );
+  });
 });