feat: Introduce configurable docs link and remove hardcoded chat links

- Added a new GeneralSetting struct to manage configurable docs link
- Removed hardcoded ChatLink and ChatLink2 variables across multiple files
- Updated frontend components to dynamically render docs link from status
- Simplified chat and link-related logic in various components
- Added a warning modal for quota per unit setting in operation settings

web/src/components/OperationSetting.js

@@ -34,8 +34,8 @@ const OperationSetting = () => {
     GroupRatio: '',
     UserUsableGroups: '',
     TopUpLink: '',
-    ChatLink: '',
-    ChatLink2: '', // 添加的新状态变量
+    'general_setting.docs_link': '',
+    // ChatLink2: '', // 添加的新状态变量
     QuotaPerUnit: 0,
     AutomaticDisableChannelEnabled: false,
     AutomaticEnableChannelEnabled: false,