fix: края архива, истории, пагинации и лимита попыток

services/identity-service/src/main/kotlin/ru/ysu/lms/identity/roster/GroupService.kt

@@ -290,7 +290,7 @@ class GroupService(
             MembershipHistoryRow(
                 id = event.id.toString(),
                 studentId = event.studentId.toString(),
-                studentName = studentsById[event.studentId]?.fullName.orEmpty(),
+                studentName = studentsById[event.studentId]?.fullName?.takeIf { it.isNotBlank() } ?: event.studentId.toString(),
                 fromGroupId = event.fromGroupId?.toString(),
                 fromGroupName = event.fromGroupId?.let { groupsById[it]?.name },
                 toGroupId = event.toGroupId?.toString(),
@@ -306,8 +306,8 @@ class GroupService(
     @Transactional
     fun restoreGroup(groupId: UUID): GroupDetail {
         val group = groups.findById(groupId).orElseThrow { NotFoundException("Группа не найдена") }
-        if (group.status == GroupStatus.ACTIVE) {
-            throw BadRequestException("Группа ${group.name} уже активна")
+        if (group.status != GroupStatus.ARCHIVED) {
+            throw BadRequestException("Группа ${group.name} не находится в архиве")
         }
         group.status = GroupStatus.ACTIVE
         groups.save(group)