refactor(dramas): 重构短剧预搜索功能，改为搜索短剧本身

1.  将预搜索接口从剧集维度改为短剧维度，移除剧集相关逻辑
2.  新增短剧列表按标题筛选的能力
3.  更新测试用例与接口文档，修正命名与逻辑

test/dramas.e2e-spec.ts

@@ -419,8 +419,8 @@ describe('Dramas and episodes', () => {
     );
   });
 
-  it('presearches published approved videos by keyword for mini app clients', async () => {
-    const drama = await request(app.getHttpServer())
+  it('presearches published dramas by drama title for mini app clients', async () => {
+    await request(app.getHttpServer())
       .post('/api/admin/v1/dramas')
       .set('Authorization', `Bearer ${adminToken}`)
       .send({
@@ -432,14 +432,25 @@ describe('Dramas and episodes', () => {
       })
       .expect(201);
 
+    const episodeOnlyDrama = await request(app.getHttpServer())
+      .post('/api/admin/v1/dramas')
+      .set('Authorization', `Bearer ${adminToken}`)
+      .send({
+        title: 'Episode Only Drama',
+        coverUrl: 'https://cdn.example.com/episode-only-drama.jpg',
+        type: 'romance',
+        status: 'published',
+      })
+      .expect(201);
+
     await request(app.getHttpServer())
       .post('/api/admin/v1/episodes')
       .set('Authorization', `Bearer ${adminToken}`)
       .send({
-        dramaId: drama.body.data.id,
+        dramaId: episodeOnlyDrama.body.data.id,
         episodeNo: 1,
-        title: 'Pilot Video Match',
-        description: 'The first skyline episode.',
+        title: 'Skyline Episode Title Only',
+        description: 'This should not make the drama match.',
         coverUrl: 'https://cdn.example.com/skyline-ep1.jpg',
         videoUrl: 'https://cdn.example.com/skyline-ep1.mp4',
         byteplusVid: 'vid_skyline_001',
@@ -453,20 +464,13 @@ describe('Dramas and episodes', () => {
       .expect(201);
 
     await request(app.getHttpServer())
-      .post('/api/admin/v1/episodes')
+      .post('/api/admin/v1/dramas')
       .set('Authorization', `Bearer ${adminToken}`)
       .send({
-        dramaId: drama.body.data.id,
-        episodeNo: 2,
-        title: 'Hidden Draft Video',
-        description: 'Contains skyline but is not published.',
-        coverUrl: 'https://cdn.example.com/skyline-ep2.jpg',
-        videoUrl: 'https://cdn.example.com/skyline-ep2.mp4',
-        byteplusVid: 'vid_skyline_002',
-        durationSeconds: 180,
+        title: 'Skyline Draft Drama',
+        coverUrl: 'https://cdn.example.com/skyline-draft-drama.jpg',
+        type: 'romance',
         status: 'draft',
-        publishStatus: 'draft',
-        reviewStatus: 'approved',
       })
       .expect(201);
 
@@ -478,19 +482,17 @@ describe('Dramas and episodes', () => {
     expect(response.body.data.pagination.pageSize).toBe(10);
     expect(response.body.data.list).toEqual([
       expect.objectContaining({
-        dramaId: drama.body.data.id,
-        episodeNo: 1,
-        title: 'Pilot Video Match',
-        coverUrl: 'https://cdn.example.com/skyline-ep1.jpg',
-        videoUrl: 'https://cdn.example.com/skyline-ep1.mp4',
-        byteplusVid: 'vid_skyline_001',
-        durationSeconds: 180,
-        freeType: 'free',
-        price: 0,
-        dramaTitle: 'Skyline Keyword Saga',
-        dramaCoverUrl: 'https://cdn.example.com/skyline-drama.jpg',
+        title: 'Skyline Keyword Saga',
+        coverUrl: 'https://cdn.example.com/skyline-drama.jpg',
+        status: 'published',
       }),
     ]);
+    expect(response.body.data.list).not.toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({ title: 'Episode Only Drama' }),
+        expect.objectContaining({ title: 'Skyline Draft Drama' }),
+      ]),
+    );
 
     const emptyKeyword = await request(app.getHttpServer())
       .get('/api/app/v1/dramas/presearch')