fix: 批量修正 external 字面量

src/commands/mcp/mcp.tsx

@@ -77,7 +77,7 @@ export async function call(onDone: LocalJSXCommandOnDone, _context: unknown, arg
   }
 
   // Redirect base /mcp command to /plugins installed tab for ant users
-  if (("external" as string) === 'ant') {
+  if ((process.env.USER_TYPE) === 'ant') {
     return <PluginSettings onComplete={onDone} args="manage" showMcpRedirectMessage />;
   }
   return <MCPSettings onComplete={onDone} />;