feat(api): 加C端分类频道和剧单详情接口

fruitshorts-module-content/src/main/java/com/fruitshorts/content/service/DramaClassificationService.java

@@ -27,6 +27,7 @@ import org.springframework.util.StringUtils;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.stream.Collectors;
 
 /**
  * 运营分类服务。分类是独立于「短剧类型（drama_category）」的一套概念，
@@ -190,6 +191,37 @@ public class DramaClassificationService {
         }
     }
 
+    // ========== C 端只读视图 ==========
+
+    /** C 端：只返回已启用（status=1）的分类，按 sort 升序。 */
+    public List<DramaClassification> listEnabled() {
+        return classificationMapper.selectList(Wrappers.<DramaClassification>lambdaQuery()
+                .eq(DramaClassification::getStatus, 1)
+                .orderByAsc(DramaClassification::getSort)
+                .orderByAsc(DramaClassification::getId));
+    }
+
+    /** C 端：校验分类存在且启用。 */
+    public DramaClassification getEnabledById(Long id) {
+        DramaClassification entity = getExisting(id);
+        if (entity.getStatus() != 1) {
+            throw new ServiceException(ErrorCode.DATA_NOT_FOUND, "分类不存在或已下架");
+        }
+        return entity;
+    }
+
+    /** C 端：分类下关联的全部 dramaId（按关联创建时间 desc）。 */
+    public List<Long> listDramaIdsByClassification(Long classificationId) {
+        return classificationDramaMapper.selectList(
+                        Wrappers.<DramaClassificationDrama>lambdaQuery()
+                                .eq(DramaClassificationDrama::getClassificationId, classificationId)
+                                .orderByDesc(DramaClassificationDrama::getCreatedAt)
+                                .orderByDesc(DramaClassificationDrama::getId))
+                .stream()
+                .map(DramaClassificationDrama::getDramaId)
+                .collect(Collectors.toList());
+    }
+
     private DramaBriefVO toBrief(Drama drama) {
         DramaBriefVO vo = new DramaBriefVO();
         vo.setId(drama.getId());

fruitshorts-module-content/src/main/java/com/fruitshorts/content/service/DramaPlaylistCategoryService.java

@@ -27,6 +27,7 @@ import org.springframework.util.StringUtils;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.stream.Collectors;
 
 /**
  * 剧单分类服务：分类直接关联短剧，没有「剧单」这一层。
@@ -177,6 +178,26 @@ public class DramaPlaylistCategoryService {
         return counts;
     }
 
+    /** C 端用：只返回已启用（status=1）的剧单。 */
+    public DramaPlaylistCategory getEnabledById(Long id) {
+        DramaPlaylistCategory entity = getExisting(id);
+        if (entity.getStatus() == null || entity.getStatus() != 1) {
+            throw new ServiceException(ErrorCode.DATA_NOT_FOUND, "剧单不存在或已下架");
+        }
+        return entity;
+    }
+
+    /** C 端用：剧单下关联的全部 dramaId（按 created_at desc）。 */
+    public List<Long> listDramaIdsByCategory(Long categoryId) {
+        return categoryDramaMapper.selectList(Wrappers.<DramaPlaylistCategoryDrama>lambdaQuery()
+                        .eq(DramaPlaylistCategoryDrama::getCategoryId, categoryId)
+                        .orderByDesc(DramaPlaylistCategoryDrama::getCreatedAt)
+                        .orderByDesc(DramaPlaylistCategoryDrama::getId))
+                .stream()
+                .map(DramaPlaylistCategoryDrama::getDramaId)
+                .collect(Collectors.toList());
+    }
+
     private DramaPlaylistCategory getExisting(Long id) {
         DramaPlaylistCategory entity = id == null ? null : categoryMapper.selectById(id);
         if (entity == null) {

fruitshorts-module-content/src/main/java/com/fruitshorts/content/service/DramaService.java

@@ -226,6 +226,22 @@ public class DramaService {
         return dramaMapper.selectPage(page, wrapper).getRecords();
     }
 
+    /** C 端分类频道：按分类分页查已上线短剧，含 total。 */
+    public PageResult<Drama> pagePublishedByCategory(Long categoryId, int pageIndex, int pageSize) {
+        int safeIndex = Math.max(1, pageIndex);
+        int safeSize = Math.max(1, Math.min(pageSize, 50));
+        Page<Drama> page = new Page<>(safeIndex, safeSize);
+        LambdaQueryWrapper<Drama> wrapper = Wrappers.<Drama>lambdaQuery()
+                .eq(Drama::getStatus, ContentStatus.PUBLISHED.getCode());
+        if (categoryId != null && categoryId > 0) {
+            DramaMultiTagSupport.applyCategoryIdTokens(wrapper, List.of(categoryId));
+        }
+        wrapper.orderByDesc(Drama::getSort).orderByDesc(Drama::getViewCount)
+                .orderByDesc(Drama::getId);
+        IPage<Drama> result = dramaMapper.selectPage(page, wrapper);
+        return new PageResult<>(result.getTotal(), result.getRecords());
+    }
+
     /** 已上线短剧，按上线时间倒序 */
     public List<Drama> listPublishedLatest(long limit) {
         Page<Drama> page = new Page<>(1, Math.max(1, limit));