采集地址：穿梭框显示全部同品牌机床、删除按钮禁用、后端Delete抛异常、数据库允许NULL

frontend/src/views/collect-address/CollectAddressListPage.vue

@@ -17,7 +17,7 @@
       <el-table-column label="操作" width="120" align="center"><template #default="{row}">
         <div style="white-space:nowrap">
           <el-button link type="primary" @click="handleEdit(row)">编辑</el-button>
-          <el-button link type="danger" @click="handleDelete(row)">删除</el-button>
+          <el-button link type="danger" :disabled="row.machineCount>0" @click="handleDelete(row)">删除</el-button>
         </div>
       </template></el-table-column>
     </el-table>

src/CncService/Impl/CollectAddressService.cs

@@ -120,7 +120,8 @@ namespace CncService.Impl
         public bool Delete(int id)
         {
             // 检查关联机床数量
-            if (_collectAddressRepository.GetMachineCount(id) > 0) return false;
+            var count = _collectAddressRepository.GetMachineCount(id);
+            if (count > 0) throw new BusinessException(CncModels.Constants.ErrorCode.DataReferenced, $"该地址下有 {count} 台机床，请先解除关联");
             return _collectAddressRepository.Delete(id);
         }