Hardcode Firecrawl API endpoint, drop FIRECRAWL_ENDPOINT config

Firecrawl has a single public API at https://api.firecrawl.dev/v2.
The endpoint was configurable but never varied across environments,
so hardcode it as a package-level const and remove the Endpoint
field from FirecrawlConfig and all downstream wiring (bootstrap,
Helm chart, probod, vetting, cookiebanner).

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

pkg/probod/tracker_mapping.go

@@ -47,9 +47,8 @@ func (impl *Implm) buildTrackerMappingConfig(
 	}
 
 	return cookiebanner.TrackerMappingConfig{
-		LLMClient:         llmClient,
-		Model:             agentCfg.ModelName,
-		FirecrawlEndpoint: impl.cfg.Firecrawl.Endpoint,
-		FirecrawlAPIKey:   impl.cfg.Firecrawl.APIKey,
+		LLMClient:       llmClient,
+		Model:           agentCfg.ModelName,
+		FirecrawlAPIKey: impl.cfg.Firecrawl.APIKey,
 	}, nil
 }