test(feishu): add regression for audio download resource type=file (openclaw#16311) thanks @Yaxuan42

Verified:
- pnpm build
- pnpm check
- pnpm vitest run --config vitest.extensions.config.ts extensions/feishu/src/bot.test.ts extensions/feishu/src/media.test.ts

Co-authored-by: Yaxuan42 <184813557+Yaxuan42@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

extensions/feishu/src/bot.ts

@@ -460,6 +460,14 @@ function parsePostContent(content: string): {
   }
 }
 
+/**
+ * Map Feishu message type to messageResource.get resource type.
+ * Feishu messageResource API supports only: image | file.
+ */
+export function toMessageResourceType(messageType: string): "image" | "file" {
+  return messageType === "image" ? "image" : "file";
+}
+
 /**
  * Infer placeholder text based on message type.
  */
@@ -570,7 +578,7 @@ async function resolveFeishuMediaList(params: {
       return [];
     }
 
-    const resourceType = messageType === "image" ? "image" : "file";
+    const resourceType = toMessageResourceType(messageType);
     const result = await downloadMessageResourceFeishu({
       cfg,
       messageId,