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/probodconfig/config.go

@@ -62,6 +62,8 @@ type (
 		EvidenceDescriber EvidenceDescriberConfig `json:"evidence-describer"`
 		ChromeDPAddr      string                  `json:"chrome-dp-addr"`
 		SearchEndpoint    string                  `json:"search-endpoint"`
+		FirecrawlEndpoint string                  `json:"firecrawl-endpoint"`
+		FirecrawlAPIKey   string                  `json:"firecrawl-api-key"`
 		CustomDomains     CustomDomainsConfig     `json:"custom-domains"`
 		SCIMBridge        SCIMBridgeConfig        `json:"scim-bridge"`
 		ESign             ESignConfig             `json:"esign"`