feat(monitoring): add DeepSeek monitoring end-to-end

- desktop: new DeepSeek page adapter and monitor registry
- desktop: extract generic AI auth helpers into shared module and
  skip binding when challenge signals are present
- admin-web: render DeepSeek HTML answers with inline citation anchors
  and surface reference-number badges on source cards
- server: fall back to inline_links/source_panel_links and read
  text/siteName fields when extracting DeepSeek citations

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

server/internal/tenant/app/monitoring_callback_service.go

@@ -2375,8 +2375,8 @@ func extractMonitoringSourceItems(value interface{}) []MonitoringSourceItem {
 		case map[string]interface{}:
 			entry := MonitoringSourceItem{
 				URL:                  firstString(typed, "url", "cited_url", "link"),
-				Title:                optionalString(firstString(typed, "title", "cited_title", "name")),
-				SiteName:             optionalString(firstString(typed, "site_name")),
+				Title:                optionalString(firstString(typed, "title", "cited_title", "name", "text")),
+				SiteName:             optionalString(firstString(typed, "site_name", "siteName")),
 				SiteKey:              optionalString(firstString(typed, "site_key")),
 				NormalizedURL:        optionalString(firstString(typed, "normalized_url")),
 				Host:                 optionalString(firstString(typed, "host")),