Add Firecrawl web search tool for tracker mapping

Firecrawl provides higher quality search results than SearXNG.
When configured (firecrawl-endpoint + firecrawl-api-key), the
tracker-mapping agent and search toolset prefer it over the
SearXNG backend. Also improves the tracker identification prompt
with multi-strategy search queries that leverage domain signals
and adapt to tracker type.

Signed-off-by: Émile Ré <emile@probo.com>

pkg/agent/tools/search/government_db.go

@@ -21,7 +21,8 @@ import (
 	"io"
 	"net/http"
 	"net/url"
-	"time"
+
+	"go.gearno.de/kit/httpclient"
 
 	"go.probo.inc/probo/pkg/agent"
 )
@@ -49,7 +50,8 @@ type (
 )
 
 func CheckGovernmentDBTool(searchEndpoint string) agent.Tool {
-	client := &http.Client{Timeout: 15 * time.Second}
+	client := httpclient.DefaultPooledClient()
+	client.Transport = &userAgentTransport{next: client.Transport}
 
 	return agent.FunctionTool(
 		"check_government_databases",