feat(xispeak): 新增流程阶段筛选 + 监察按钮条件优化 + 流程阶段表单字段

- 列表页新增"流程阶段"下拉筛选（绑定 queryParam.completedStage）
- 编辑表单新增 completedStage 手动选择字段
- BPM 表单监察按钮仅 showJiJianFields && nonJiJianFieldsReadonly 时渲染为"监察"

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

src/views/bg/xispeak/BgXiSpeakList.vue

@@ -19,6 +19,17 @@
               <JDictSelectTag v-model:value="queryParam.completionStatus" dictCode="db_status" placeholder="请选择完成状态" allow-clear @change="searchQuery" />
             </a-form-item>
           </a-col>
+          <a-col :lg="6">
+            <a-form-item name="completedStage" label="流程阶段">
+              <a-select v-model:value="queryParam.completedStage" placeholder="请选择" allow-clear @change="searchQuery">
+                <a-select-option :value="0">未发起流程</a-select-option>
+                <a-select-option :value="1">正在落实措施收集流程</a-select-option>
+                <a-select-option :value="2">落实措施收集流程结束</a-select-option>
+                <a-select-option :value="3">正在经办人执行反馈流程</a-select-option>
+                <a-select-option :value="4">经办人执行反馈流程结束</a-select-option>
+              </a-select>
+            </a-form-item>
+          </a-col>
           <a-col :lg="4" :md="8" :sm="12">
             <span class="table-page-search-submitButtons">
               <a-button type="primary" preIcon="ant-design:search-outlined" @click="searchQuery">查询</a-button>