fix(ingest): raise ref cap to 50 and clarify invalid bvid error

reaction_board/notify/telegram.py

@@ -80,6 +80,9 @@ def format_manual_reply(manual_result: Any) -> str:
         return "未识别到 B 站视频引用，请发送视频链接或 BV 号，例如 BV1x8x166EzY。"
     results = list(getattr(manual_result, "results", []) or [])
     lines = [_result_line(item) for item in results]
+    truncated = int(getattr(manual_result, "truncated", 0) or 0)
+    if truncated > 0:
+        lines.append(f"⚠️ 本消息还有 {truncated} 个引用未处理，请分批再发一次。")
     header = f"共识别 {refs} 个引用，入库 {int(getattr(manual_result, 'added', 0) or 0)} 条："
     return "\n".join([header, *lines])