refactor(workservice): 迁移AI批改逻辑到定时任务，移除消费端评分逻辑

1. 新增JournalTaskAiScoreJob定时任务，实现周期性扫描处理期刊答题记录AI批改
2. 调整appsettings.json配置，新增定时任务配置与相关参数
3. 重构JournalTaskReceiveConsumer，移除原有的AI评分相关代码，仅保留答题记录保存逻辑
4. 优化任务查询条件，支持分组任务查询

QYZH.InteractiveMagazine.WorkService/appsettings.json

@@ -47,6 +47,14 @@
         "Cron": "* * * * *",
         "Enabled": false,
         "Description": "示例任务（默认关闭，仅用于验证框架运行）"
+      },
+      {
+        "Name": "journal-task-ai-score-job",
+        "JobType": "QYZH.InteractiveMagazine.WorkService.Jobs.JournalTaskAiScoreJob",
+        "MethodName": "Execute",
+        "Cron": "*/30 * * * *",
+        "Enabled": true,
+        "Description": "每30分钟扫描上次执行到本次执行之间的期刊答题记录并提交AI批改"
       }
     ]
   },
@@ -62,7 +70,8 @@
     "ScoreRetryDelayMilliseconds": 1000,
     "MaxImageBytes": 10485760,
     "CompletionThreshold": 80,
-    "CommunityScoreThreshold": 90
+    "PendingAnswerMinutes": 30,
+    "PendingAnswerBatchSize": 100
   },
   "AllowedHosts": "*",
   "AliyunOSSConfigs": {