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

crates/erp-health/src/handler/stats_handler.rs

@@ -70,19 +70,6 @@ where
 // 健康数据统计
 // ---------------------------------------------------------------------------
 
-pub async fn get_dialysis_stats<S>(
-    State(state): State<HealthState>,
-    Extension(ctx): Extension<TenantContext>,
-) -> Result<Json<ApiResponse<DialysisStatisticsResp>>, AppError>
-where
-    HealthState: FromRef<S>,
-    S: Clone + Send + Sync + 'static,
-{
-    require_permission(&ctx, "health.patient.list")?;
-    let result = stats_service::get_dialysis_statistics(&state, ctx.tenant_id).await?;
-    Ok(Json(ApiResponse::ok(result)))
-}
-
 pub async fn get_lab_report_stats<S>(
     State(state): State<HealthState>,
     Extension(ctx): Extension<TenantContext>,