Move Firecrawl API key from top-level config into Agents.Tools

Firecrawl is a tool used by agents (tracker mapping, third-party
assessor), so its configuration belongs under AgentsConfig rather than
as a standalone Config field. Adds AgentToolsConfig to hold agent tool
credentials and updates all config propagation consumers.

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

pkg/probod/tracker_mapping.go

@@ -49,6 +49,6 @@ func (impl *Implm) buildTrackerMappingConfig(
 	return cookiebanner.TrackerMappingConfig{
 		LLMClient:       llmClient,
 		Model:           agentCfg.ModelName,
-		FirecrawlAPIKey: impl.cfg.Firecrawl.APIKey,
+		FirecrawlAPIKey: impl.cfg.Agents.Tools.FirecrawlAPIKey,
 	}, nil
 }