Fix Bug #464: [目录管理-诊疗目录] 新增项目时"零售价"未与"诊疗子项"合计总价自动同步

根因：calculateTotalPrice中form.value.retailPrice赋值被nextTick包裹，
在多调用方(watcher/selectRow/addItem)并发时产生竞态，导致零售价更新丢失
修复：移除nextTick，改为同步赋值确保零售价实时同步总价

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

openhis-ui-vue3/src/views/catalog/diagnosistreatment/components/diagnosisTreatmentDialog.vue

@@ -473,15 +473,12 @@ function calculateTotalPrice() {
       }
     });
     totalPrice.value = sum.toFixed(2);
-    // Bug #464: 零售价与诊疗子项合计总价实时同步
+    // Bug #464: 零售价与诊疗子项合计总价实时同步，直接赋值不使用nextTick避免多调用方竞争
     const hasValidItem = treatmentItems.value.some(
       (item) => item.adviceDefinitionId && item.adviceDefinitionId !== ''
     );
     if (hasValidItem) {
-      // 使用 nextTick 确保总价更新后零售价才更新，避免 Vue 响应式时序问题
-      nextTick(() => {
-        form.value.retailPrice = parseFloat(totalPrice.value) || 0;
-      });
+      form.value.retailPrice = parseFloat(totalPrice.value) || 0;
     } else {
       form.value.retailPrice = undefined;
     }
@@ -763,10 +760,7 @@ function selectRow(row, index) {
   treatmentItems.value[index].adviceDefinitionId = row.id;
   treatmentItems.value[index].retailPrice = row.retailPrice || 0;
   medicineSearchKey.value = '';
-  // 使用 nextTick 确保 DOM 更新后再计算总价
-  nextTick(() => {
-    calculateTotalPrice();
-  });
+  calculateTotalPrice();
 }
 
 // 清空诊疗子项