!74 fix(bpm): 修复选人组件 Name 翻译使用错误字段及查询顺序问题

* fix(bpm): 修复选人组件 Name 翻译使用错误字段及查询顺序问题
* feat(bpm): 默认审批意见改为完全由后端节点配置驱动，移除所有写死模板
* fix(bpm): 修复节点默认审批意见配置 UI 绑定错误，支持 extraVars 变量解析
* feat(bpm): 新增条件变量默认审批意见，支持按流程变量值动态预填审批意见

src/views/bg/xispeak/components/BgXiSpeakBPMForm.vue

@@ -266,7 +266,7 @@
 </template>
 
 <script lang="ts" setup>
-  import { computed, onMounted, reactive, ref, watch } from 'vue';
+  import { computed, onMounted, reactive, ref, watch, provide } from 'vue';
   import { defHttp } from '/@/utils/http/axios';
 
   import { useMessage } from '/@/hooks/web/useMessage';
@@ -487,6 +487,18 @@ import {
     return builder ? builder() : '';
   });
 
+  // 合并 mainForm + 表单局部变量，供占位符 ${变量名} 解析
+  const formScope = computed(() => ({
+    ...mainForm,
+    isEnd: isEnd.value,
+    subApproveUser: subApproveUser.value,
+    subApproveUserNameText: subApproveUserNameText.value,
+  }));
+
+  provide('extraVars', formScope);
+  provide('flowVars', computed(() => props.formData?.vars || {}));
+  provide('formDefaultReason', defaultHandleReason);
+
   onMounted(() => {
     initFormData();
   });