fix(schedule): 保存草稿时设置默认日期，避免schedule_date为空导致插入失败

src/main/java/org/springblade/modules/martial/service/impl/MartialScheduleServiceImpl.java

@@ -393,10 +393,16 @@ public class MartialScheduleServiceImpl extends ServiceImpl<MartialScheduleMappe
 					dateStr = dateStr.replace("年", "-").replace("月", "-").replace("日", "");
 					detail.setScheduleDate(LocalDate.parse(dateStr));
 				} catch (Exception e) {
-					// 日期解析失败，忽略
+					// 日期解析失败，使用当天日期
+					detail.setScheduleDate(LocalDate.now());
 				}
 			}
 
+			// 如果日期仍为空，设置默认日期
+			if (detail.getScheduleDate() == null) {
+				detail.setScheduleDate(LocalDate.now());
+			}
+
 			if (detail.getId() == null) {
 				scheduleDetailMapper.insert(detail);
 			} else {