fix: 批量修正 external 字面量

src/components/MessageSelector.tsx

@@ -118,7 +118,7 @@ export function MessageSelector({
       ...summarizeInputProps,
       onChange: setSummarizeFromFeedback
     });
-    if (("external" as string) === 'ant') {
+    if ((process.env.USER_TYPE) === 'ant') {
       baseOptions.push({
         value: 'summarize_up_to',
         label: 'Summarize up to here',