fix(dialysis): 添加患者存在性校验 + 质量验证汇总

- create_dialysis_record 中添加患者存在性校验，修复集成测试
  test_dialysis_create_without_patient_returns_error
- 添加质量验证汇总报告 (docs/qa/quality-verification-summary.md)

crates/erp-dialysis/src/service/dialysis_service.rs

@@ -70,10 +70,25 @@ pub async fn create_dialysis_record(
     operator_id: Option<Uuid>,
     req: CreateDialysisRecordReq,
 ) -> DialysisResult<DialysisRecordResp> {
-    // 患者存在性由数据库 FK 约束保证，不再显式查询 patient 表
-
     validate_dialysis_type(&req.dialysis_type)?;
 
+    // 患者存在性校验
+    let patient_sql = sea_orm::Statement::from_sql_and_values(
+        sea_orm::DatabaseBackend::Postgres,
+        "SELECT EXISTS(SELECT 1 FROM patients WHERE id = $1 AND tenant_id = $2 AND deleted_at IS NULL)",
+        [req.patient_id.into(), tenant_id.into()],
+    );
+    if let Ok(row) = state.db.query_one(patient_sql).await {
+        if let Some(r) = row {
+            let exists: bool = r.try_get("", "exists").unwrap_or(false);
+            if !exists {
+                return Err(DialysisError::PatientNotFound);
+            }
+        }
+    } else {
+        return Err(DialysisError::PatientNotFound);
+    }
+
     let kek = state.crypto.kek();
 
     // PII 加密