refactor: define IScheduleStatusService interface

Phase 2, Step 2.9: Create status service interface
- Define updateParticipantCheckInStatus method signature
- Prepare for extracting status logic from MartialScheduleServiceImpl

Related to Phase 2 refactoring plan

src/main/java/org/springblade/modules/martial/service/IScheduleStatusService.java

@@ -0,0 +1,17 @@
+package org.springblade.modules.martial.service;
+
+/**
+ * Schedule Status Service Interface
+ * Responsible for managing participant check-in status
+ */
+public interface IScheduleStatusService {
+
+    /**
+     * Update participant check-in status
+     *
+     * @param participantId Participant ID
+     * @param status Check-in status
+     * @return Success flag
+     */
+    boolean updateParticipantCheckInStatus(Long participantId, String status);
+}