fix: route media files to Feishu send_message pipeline

_send_feishu already supports image/video/voice/document attachments,
but the upstream router dropped media_files into the non-media branch.
Add Feishu to the media routing section so MEDIA: tags work in
send_message for Feishu.

tools/send_message_tool.py

@@ -528,6 +528,23 @@ async def _send_to_platform(platform, pconfig, chat_id, message, thread_id=None,
             last_result = result
         return last_result
 
+    # --- Feishu: native file/image/video/voice attachment support ---
+    if platform == Platform.FEISHU and media_files:
+        last_result = None
+        for i, chunk in enumerate(chunks):
+            is_last = (i == len(chunks) - 1)
+            result = await _send_feishu(
+                pconfig,
+                chat_id,
+                chunk,
+                media_files=media_files if is_last else [],
+                thread_id=thread_id,
+            )
+            if isinstance(result, dict) and result.get("error"):
+                return result
+            last_result = result
+        return last_result
+
     # --- Non-media platforms ---
     if media_files and not message.strip():
         return {