feat(yuanbao): prioritize quote media refs over history backfill in DispatchMiddleware

gateway/platforms/yuanbao.py

@@ -2510,7 +2510,38 @@ class DispatchMiddleware(InboundMiddleware):
             media_urls = list(ctx.media_urls)
             media_types = list(ctx.media_types)
 
-            # Backfill observed media from recent transcript history
+            # If user quoted a message (reply_to_message_id is set), resolve only
+            # quote_media_refs to avoid injecting unrelated history media.
+            # Otherwise, backfill observed media from recent transcript history.
+            if ctx.reply_to_message_id is not None:
+                # User quoted a message — resolve only media from the quote
+                for rid, kind, filename in ctx.quote_media_refs:
+                    if kind not in ("image", "file"):
+                        continue
+                    try:
+                        fresh_url = await MediaResolveMiddleware._resolve_by_resource_id(adapter, rid)
+                    except Exception as exc:
+                        logger.warning(
+                            "[%s] quote media resolve failed: rid=%s kind=%s err=%s",
+                            adapter.name, rid, kind, exc,
+                        )
+                        continue
+                    cached = await MediaResolveMiddleware._download_and_cache(
+                        adapter,
+                        fetch_url=fresh_url,
+                        kind=kind,
+                        file_name=filename or None,
+                        log_tag=f"quote rid={rid}",
+                    )
+                    if cached is None:
+                        continue
+                    path, mime = cached
+                    # Avoid duplicates
+                    if path not in media_urls:
+                        media_urls.append(path)
+                        media_types.append(mime)
+            else:
+                # No quote — backfill observed media from recent transcript history
                 extra_img_urls: List[str] = []
                 extra_img_mimes: List[str] = []
                 try: