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-dialysis/src/module.rs

@@ -3,7 +3,7 @@ use axum::Router;
 use erp_core::error::AppResult;
 use erp_core::module::{ErpModule, ModuleContext, ModuleType, PermissionDescriptor};
 
-use crate::handler::{dialysis_handler, dialysis_prescription_handler};
+use crate::handler::{dialysis_handler, dialysis_prescription_handler, dialysis_stats_handler};
 use crate::state::DialysisState;
 
 pub struct DialysisModule;
@@ -54,6 +54,11 @@ impl DialysisModule {
                     .put(dialysis_prescription_handler::update_prescription)
                     .delete(dialysis_prescription_handler::delete_prescription),
             )
+            // 透析统计
+            .route(
+                "/health/admin/statistics/dialysis",
+                axum::routing::get(dialysis_stats_handler::get_dialysis_stats),
+            )
     }
 }