Remove SearXNG search backend, use Firecrawl exclusively

SearXNG was a fallback search backend that added complexity without
being used in practice. All search-dependent features (web search,
government DB checks, vetting orchestrator, tracker mapping) now use
Firecrawl exclusively. Removes the SEARCH_ENDPOINT config plumbing
from probodconfig, bootstrap, Helm charts, and all callers.

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

pkg/probod/third_party_assessor.go

@@ -48,11 +48,12 @@ func (impl *Implm) buildThirdPartyAssessor(
 	}
 
 	return vetting.NewAssessor(vetting.Config{
-		Client:         llmClient,
-		Model:          agentCfg.ModelName,
-		MaxTokens:      maxTokens,
-		ChromeAddr:     impl.cfg.ChromeDPAddr,
-		SearchEndpoint: impl.cfg.SearchEndpoint,
-		Logger:         l.Named("third-party-assessor"),
+		Client:            llmClient,
+		Model:             agentCfg.ModelName,
+		MaxTokens:         maxTokens,
+		ChromeAddr:        impl.cfg.ChromeDPAddr,
+		FirecrawlEndpoint: impl.cfg.Firecrawl.Endpoint,
+		FirecrawlAPIKey:   impl.cfg.Firecrawl.APIKey,
+		Logger:            l.Named("third-party-assessor"),
 	}), nil
 }

pkg/probod/tracker_mapping.go

@@ -49,7 +49,6 @@ func (impl *Implm) buildTrackerMappingConfig(
 	return cookiebanner.TrackerMappingConfig{
 		LLMClient:         llmClient,
 		Model:             agentCfg.ModelName,
-		SearchEndpoint:    impl.cfg.SearchEndpoint,
 		FirecrawlEndpoint: impl.cfg.Firecrawl.Endpoint,
 		FirecrawlAPIKey:   impl.cfg.Firecrawl.APIKey,
 	}, nil