feat(S-cfc-371): assessment.appointment.create 预约时间冲突校验 GREEN 实现（SC-P-36 边界）

cfc-backend/src/main/java/com/etotem/cfc/service/AssessmentAppointmentService.java

@@ -59,6 +59,22 @@ public class AssessmentAppointmentService extends ServiceImpl<AssessmentAppointm
         appointment.setNotes(notes);
         appointment.setCreatedAt(new Date());
         appointment.setUpdatedAt(new Date());
+
+        // 预约时间冲突校验（SC-P-36 边界）：同会员同日期时间已有非终态预约（0 待确认 / 1 已确认）时
+        // 拒绝创建且不落库（2 已完成 / 3 已取消 / 4 未到 为终态，不算冲突）
+        if (memberId != null && appointmentDate != null && appointmentTime != null) {
+            LambdaQueryWrapper<AssessmentAppointment> conflictWrapper = new LambdaQueryWrapper<>();
+            conflictWrapper.eq(AssessmentAppointment::getMemberId, memberId);
+            conflictWrapper.eq(AssessmentAppointment::getAppointmentDate, appointmentDate);
+            conflictWrapper.eq(AssessmentAppointment::getAppointmentTime, appointmentTime);
+            conflictWrapper.in(AssessmentAppointment::getStatus, 0, 1);
+            List<AssessmentAppointment> conflicts = assessmentAppointmentMapper.selectList(conflictWrapper);
+            if (conflicts != null && !conflicts.isEmpty()) {
+                throw new RuntimeException(
+                        "预约时间冲突：该会员在所选日期时间已有待确认/已确认的测评预约，请调整预约时间");
+            }
+        }
+
         this.save(appointment);
 
         // 测评预约能量发放