fix: 修正产品规格值product_spec的显示问题

- subItem.value => subItem.key
- 调整后端CMS的结构，将规格值移入translations中

app/components/pages/products/SpecTable.vue

@@ -11,7 +11,7 @@
           <el-descriptions-item
             v-for="subItem in item.specs"
             :key="subItem.key"
-            :label="subItem.value"
+            :label="subItem.key"
           >
             {{ subItem.value }}
           </el-descriptions-item>