feat: the assistant's search engine in Настройки - DuckDuckGo, a SearXNG of one's own, Brave Search or Tavily, with DuckDuckGo behind the chosen one

internal/server/handlers_panel.go

@@ -444,6 +444,7 @@ func (s *Server) handleSettings(w http.ResponseWriter, r *http.Request) {
 		"InstallWget":   fmt.Sprintf("wget -qO- %s/install.sh | sudo HOST=%s ENROLL_SECRET=%s sh", host, host, secret),
 		"ServerVersion": Version,
 		"AI":            s.aiConfig(),
+		"Search":        s.searchConf(),
 		"DBNow":         dbNow,
 		"DBChosen":      dbChosen,
 		"UfwInstalled":  ufwInstalled,