Clarify dataset access before downloading the task list

Explain the existing Hugging Face gated dataset access requirement in English and Chinese. Dataset permissions remain unchanged.

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@@ -54,6 +54,7 @@
 <span data-en="Download task list ↓" data-zh="下载任务清单 ↓" >Download task list ↓</span>
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+<p class="source-note" data-en="Dataset downloads require a Hugging Face account with access. Open the dataset to request access before using the download link." data-zh="下载数据需要登录 Hugging Face 并获得访问权限；请先打开数据集申请访问，再使用下载链接。">Dataset downloads require a Hugging Face account with access. Open the dataset to request access before using the download link.</p>
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@@ -125,7 +126,7 @@
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 <h3 data-en="What the evaluator keeps separate" data-zh="评测侧独立保存的内容" >What the evaluator keeps separate</h3>
-<p data-en="Reference answers and replication programs are kept outside the model input during evaluation. Public dataset downloads can contain references." data-zh="评测时参考答案与复现程序不进入模型输入；公开数据集下载文件可能包含这些参考资料。" >Reference answers and replication programs are kept outside the model input during evaluation. Public dataset downloads can contain references.</p>
+<p data-en="Reference answers and replication programs are kept outside the model input during evaluation. Dataset downloads can contain references." data-zh="评测时参考答案与复现程序不进入模型输入；数据集下载文件可能包含这些参考资料。" >Reference answers and replication programs are kept outside the model input during evaluation. Dataset downloads can contain references.</p>
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