refactor(service): 补充期刊相关实体的关联删除与prompt字段映射

1. 为JournalPageTaskService新增BasePrompt和CustomPrompt字段的赋值映射
2. 为JournalService注入JournalPageTaskAnswerRepository并完善关联删除逻辑，先删除任务答案再删除任务本身

QYZH.InteractiveMagazine.Service/JournalPageTaskService.cs

@@ -66,6 +66,8 @@ public class JournalPageTaskService(BaseRepository<Journal> journalRepository, O
         task.Expression = input.Expression;
         task.Persuasiveness = input.Persuasiveness;
         task.AnswerTime = input.AnswerTime;
+        task.BasePrompt = input.BasePrompt;
+        task.CustomPrompt = input.CustomPrompt;
         
 
         var no = input.No.Split('-').Select(int.Parse).ToArray();