fix(web): 请求超时提升至60s + 复制新建按钮loading态

- request.js 超时 10s->60s，适配长耗时接口
- ArticleEdit 复制并新建按钮加 loading 防重复点击

Ultraworked with [Sisyphus](https://github.com/OhMyOpenCode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

cfc-web/src/utils/request.js

@@ -4,7 +4,7 @@ import router from '@/router'
 
 const service = axios.create({
   baseURL: process.env.VUE_APP_BASE_API || '',
-  timeout: 10000
+  timeout: 60000
 })
 
 // 请求拦截器

cfc-web/src/views/admin/ArticleEdit.vue

@@ -14,7 +14,7 @@
             <el-button type="primary" @click="handleReDraft" :loading="reDraftLoading">保存到草稿箱重新编辑</el-button>
           </template>
           <template v-if="readonly && articleStatus !== 'rejected'">
-            <el-button type="default" @click="handleCopyAsNew">复制并新建</el-button>
+            <el-button type="default" @click="handleCopyAsNew" :loading="saving">复制并新建</el-button>
           </template>
         </div>
       </div>