feat(notify): 钉钉查看详情链接加粗并增加分割线分隔

用 --- 分割线将 CVE 列表与底部链接隔开，链接文字加粗，
提升视觉层级，让查看详情更醒目。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: freemankevin

app/notifiers/dingtalk.py

@@ -95,7 +95,7 @@ def _fmt_version(val):
             soft_truncated=soft_truncated,
             sep="\n---\n",
         )
-        footer = f"\n\n[查看详情]({report.details_url})"
+        footer = f"\n\n---\n\n**[查看详情]({report.details_url})**"
         full_text = f"{head_block}\n---\n{body}{footer}".rstrip()
 
         return {