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/web/src/api/health/points.ts

@@ -214,7 +214,6 @@ export interface VitalSignsReportRate {
 }
 
 export interface HealthDataStats {
-  dialysis: DialysisStatistics;
   lab_reports: LabReportStatistics;
   appointments: AppointmentStatistics;
   vital_signs_report_rate: VitalSignsReportRate;
@@ -376,6 +375,14 @@ export const pointsApi = {
     return data.data;
   },
 
+  getDialysisStats: async (): Promise<DialysisStatistics> => {
+    const { data } = await client.get<{
+      success: boolean;
+      data: DialysisStatistics;
+    }>('/health/admin/statistics/dialysis');
+    return data.data;
+  },
+
   getPersonalStats: async (): Promise<PersonalStats> => {
     const { data } = await client.get<{
       success: boolean;