feat: 添加动态配置API基础URL功能

在config.js中添加全局变量__API_BASE__，并在main.js中实现优先使用配置的API基础URL，其次使用location.origin或默认值的逻辑

web/config.js

@@ -0,0 +1 @@
+window.__API_BASE__ = ''

web/index.html

@@ -305,6 +305,7 @@
     </template>
   </el-dialog>
 </div>
+<script src="./config.js"></script>
 <script src="./vendor/vue.global.prod.js"></script>
 <script src="./vendor/element-plus.full.min.js"></script>
 <script src="./main.js"></script>

web/main.js

@@ -37,7 +37,7 @@ const { createApp, reactive } = Vue;
       exportTpl: { id: null, filters: {}, main_table: '', fields: [], datasource: '', file_format: '' }
     })
     
-    const API_BASE = 'http://localhost:8077'
+    const API_BASE = (window.__API_BASE__ && String(window.__API_BASE__).trim()) ? String(window.__API_BASE__).trim() : (typeof location !== 'undefined' ? location.origin : 'http://localhost:8077')
     const getUserId = ()=>{
       const sp = new URLSearchParams(window.location.search||'')
       const v = sp.get('userId') || sp.get('userid') || sp.get('user_id')