feat(plan): 添加周末计划生成日志记录

- 在生成周末计划开始处添加日志输出
- 有助于调试和监控计划生成流程

enlish-service/src/main/java/com/yinlihupo/enlish/service/service/plan/LessonPlansServiceImpl.java

@@ -155,6 +155,7 @@ public class LessonPlansServiceImpl implements LessonPlansService {
 
 
         try {
+            log.info("开始生成周末计划");
             int syncWeekendSize = totalWords.size() / 2;
             for (int i = 0; i < 2; i++) {
                 List<VocabularyBankDO> checkList = totalWords.subList(i * syncWeekendSize, Math.min((i + 1) * syncWeekendSize, syncWeekendSize));