fix(MmInventory): 恢复编辑功能并修复物料编码选择禁用问题

恢复物料管理库存页面的编辑功能，移除注释代码。同时修复物料编码选择框被错误禁用的问题，添加value-key属性确保选项正确绑定。

src/views/materialManagement/productionMaterial/MmInventory.vue

@@ -119,7 +119,7 @@
                     <el-dropdown>
                         <template #dropdown>
                             <el-dropdown-menu>
-                                <!-- <el-dropdown-item @click="handleUpdate(scope.row)">编辑</el-dropdown-item> -->
+                                <el-dropdown-item @click="handleUpdate(scope.row)">编辑</el-dropdown-item>
                                 <el-dropdown-item @click="handleStorage(scope.row)">入库</el-dropdown-item>
                                 <el-dropdown-item @click="handleOutStorage(scope.row)">出库</el-dropdown-item>
                             </el-dropdown-menu>
@@ -457,7 +457,7 @@
                 <el-row :gutter="20">
                     <el-col :lg="12">
                         <el-form-item label="物料编码" prop="materialCode">
-                            <el-select @change="handleMaterialChange" v-model="form.materialCode" filterable placeholder="请选择" :disabled="true">
+                            <el-select value-key="id" @change="handleMaterialChange" v-model="form.materialCode" filterable placeholder="请选择">
                                 <el-option
                                     v-for="(item, index) in options"
                                     :key="`${item.materialCode}-${item.supplierCode || 'none'}`"