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/HeaderBar.js

@@ -44,6 +44,7 @@ const HeaderBar = () => {
 
   // Check if self-use mode is enabled
   const isSelfUseMode = statusState?.status?.self_use_mode_enabled || false;
+  const docsLink = statusState?.status?.docs_link || '';
   const isDemoSiteMode = statusState?.status?.demo_site_enabled || false;
 
   let buttons = [
@@ -62,6 +63,13 @@ const HeaderBar = () => {
       itemKey: 'pricing',
       to: '/pricing',
     },
+    // Only include the docs button if docsLink exists
+    ...(docsLink ? [{
+      text: t('文档'),
+      itemKey: 'docs',
+      isExternal: true,
+      externalLink: docsLink,
+    }] : []),
     {
       text: t('关于'),
       itemKey: 'about',
@@ -157,13 +165,25 @@ const HeaderBar = () => {
                     }
                   }
                 }}>
-                  <Link
-                    className="header-bar-text"
-                    style={{ textDecoration: 'none' }}
-                    to={routerMap[props.itemKey]}
-                  >
-                    {itemElement}
-                  </Link>
+                  {props.isExternal ? (
+                    <a
+                      className="header-bar-text"
+                      style={{ textDecoration: 'none' }}
+                      href={props.externalLink}
+                      target="_blank"
+                      rel="noopener noreferrer"
+                    >
+                      {itemElement}
+                    </a>
+                  ) : (
+                    <Link
+                      className="header-bar-text"
+                      style={{ textDecoration: 'none' }}
+                      to={routerMap[props.itemKey]}
+                    >
+                      {itemElement}
+                    </Link>
+                  )}
                 </div>
               );
             }}