Stabilize source health monitoring

08-threat-intel/generated/dashboard/docs/source-catalog-audit.html

@@ -88,7 +88,7 @@
       <div class="meta">工作台内置镜像页：active/retired source、replacement map 与覆盖摘要。</div>
       <pre># Source Catalog Audit
 
-- generated_at: `2026-03-19T02:22:09+00:00`
+- generated_at: `2026-03-19T02:26:48+00:00`
 - systems: `62`
 - sources: `173`
 - active_sources: `118`