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/third_party_assessor.go

@@ -52,7 +52,7 @@ func (impl *Implm) buildThirdPartyAssessor(
 		Model:           agentCfg.ModelName,
 		MaxTokens:       maxTokens,
 		ChromeAddr:      impl.cfg.ChromeDPAddr,
-		FirecrawlAPIKey: impl.cfg.Firecrawl.APIKey,
+		FirecrawlAPIKey: impl.cfg.Agents.Tools.FirecrawlAPIKey,
 		Logger:          l.Named("third-party-assessor"),
 	}), nil
 }

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
 }