refactor: 统一术语BOM为物料清单并补充工位扩展能力

主要变更：
1.  后端：重构工位管理逻辑，新增工位自定义扩展能力，将工位号上限调整为999并支持14+虚拟工位
2.  前后端：全量替换"BOM"术语为"物料清单"，包括提示语、注释和文档
3.  WMS模块：新增AGV任务取消接口与前端页面，对接海康RCS取消任务逻辑
4.  权限与种子数据：新增工位新增权限并更新权限配置
5.  修复错误校验逻辑，优化AGV客户端签名与请求处理

bj_power_wms/frontend/src/pages/Agv.vue

@@ -127,7 +127,34 @@ async function refreshTasks() {
 function onSelectionChange(sel) { selected.value = sel }
 function rowKey(row) { return row.requestNo + '-' + row.materialCode + '-' + row.planDate }
 
-onMounted(() => { loadDocks(); loadTasks() })
+/* ===================== 取消任务 / 对接模式 ===================== */
+const agvMode = reactive({ mock: false, tip: '' })
+
+function canCancel(status) {
+  return status === 'PENDING' || status === 'DISPATCHED' || status === 'DELIVERING'
+}
+
+async function cancelTask(row) {
+  const { value: reason } = await ElMessageBox.prompt(
+    `确认取消 AGV 任务 ${row.taskNo}（${row.sourceDock} → ${row.targetDock}）？\n取消后关联的备料单行将退回待发料。`,
+    '取消 AGV 任务',
+    { type: 'warning', confirmButtonText: '确认取消', cancelButtonText: '返回', inputPlaceholder: '取消原因（选填）', inputValue: '' }
+  ).catch(() => ({ value: null }))
+  if (reason === null) return
+  await request.post('/agv/cancel', { taskNo: row.taskNo, reason: reason || '' })
+  ElMessage.success('已取消')
+  loadTasks(); loadDocks()
+}
+
+async function loadMode() {
+  try {
+    const m = await request.get('/agv/mode')
+    agvMode.mock = !!m?.mock
+    agvMode.tip = m?.tip || ''
+  } catch { /* 忽略 */ }
+}
+
+onMounted(() => { loadDocks(); loadTasks(); loadMode() })
 </script>
 
 <template>
@@ -154,6 +181,8 @@ onMounted(() => { loadDocks(); loadTasks() })
 
       <!-- ② AGV 任务列表 -->
       <el-tab-pane label="AGV任务" name="tasks" lazy>
+        <el-alert v-if="agvMode.mock" type="warning" :closable="false" show-icon style="margin-bottom:10px"
+                  title="当前为模拟模式（未接真实海康 RCS）" :description="agvMode.tip" />
         <div class="toolbar">
           <el-select v-model="taskQuery.status" clearable placeholder="任务状态" style="width: 140px" @change="taskPage.current = 1; loadTasks()">
             <el-option v-for="s in statusOptions" :key="s.v" :label="s.l" :value="s.v" />
@@ -193,6 +222,12 @@ onMounted(() => { loadDocks(); loadTasks() })
           <el-table-column prop="operator" label="下发人" width="100" />
           <el-table-column prop="hikTaskCode" label="RCS任务码" width="150" show-overflow-tooltip />
           <el-table-column prop="remark" label="备注" min-width="140" show-overflow-tooltip />
+          <el-table-column label="操作" width="90" align="center" fixed="right">
+            <template #default="{ row }">
+              <el-button v-if="canCancel(row.status)" size="small" type="danger" plain @click="cancelTask(row)">取消</el-button>
+              <span v-else>-</span>
+            </template>
+          </el-table-column>
         </el-table>
         <el-pagination background layout="total, sizes, prev, pager, next" :total="taskTotal"
                        :current-page="taskPage.current" :page-size="taskPage.size" :page-sizes="[10, 20, 50, 100]"