refactor(dialysis+health): 透析统计从 erp-health 迁移到 erp-dialysis，消除跨 crate 残留

- erp-dialysis: 新建 dialysis_stats_dto/handler/service，注册 /health/admin/statistics/dialysis 路由
- erp-health: 删除 get_dialysis_statistics 及 helper、DialysisStatisticsResp、
  DialysisRecordNotFound/DialysisPrescriptionNotFound、validate_dialysis_status* 及 9 个测试、
  DoctorDashboard.pending_dialysis_review、module 路由
- Web: HealthDataStats 移除 dialysis 字段，新增 getDialysisStats() 独立 API，
  useStatsData 并行 fetch，HealthDataCenter 接受独立 dialysisData prop
- 小程序: DoctorDashboard 移除 pending_dialysis_review，医护工作台移除"待审透析"卡片

apps/miniprogram/src/pages/doctor/index.tsx

@@ -21,7 +21,6 @@ const CARDS: CardConfig[] = [
 ];
 
 const HEALTH_CARDS: CardConfig[] = [
-  { key: 'pending_dialysis_review', label: '待审透析', initial: '透', route: '/pages/doctor/patients/index' },
   { key: 'pending_lab_review', label: '待审化验', initial: '化', route: '/pages/doctor/report/index' },
   { key: 'today_appointments', label: '今日预约', initial: '约', route: '/pages/doctor/patients/index' },
 ];

apps/miniprogram/src/services/doctor.ts

@@ -8,7 +8,6 @@ export interface DoctorDashboard {
   unread_messages: number;
   pending_follow_ups: number;
   today_consultations: number;
-  pending_dialysis_review: number;
   pending_lab_review: number;
   today_appointments: number;
 }