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>

contrib/helm/charts/probo/templates/deployment.yaml

@@ -244,11 +244,6 @@ spec:
                   name: {{ include "probo.fullname" . }}
                   key: firecrawl-api-key
             {{- end }}
-            # Search Endpoint
-            {{- if .Values.probo.searchEndpoint }}
-            - name: SEARCH_ENDPOINT
-              value: {{ .Values.probo.searchEndpoint | quote }}
-            {{- end }}
             # Tracker Mapping Agent
             {{- if .Values.probo.trackerMapping.provider }}
             - name: AGENT_TRACKER_MAPPING_PROVIDER

contrib/helm/charts/probo/values-production.yaml.example

@@ -164,9 +164,6 @@ probo:
   #   endpoint: "https://api.firecrawl.dev/v2"
   #   apiKey: "CHANGE_ME_FIRECRAWL_API_KEY"
 
-  # SearXNG search endpoint (optional, fallback when Firecrawl is not configured)
-  # searchEndpoint: "https://search.example.com"
-
   # Tracker mapping agent (optional, auto-links tracker patterns to vendors)
   # trackerMapping:
   #   provider: "openai"

contrib/helm/charts/probo/values.yaml

@@ -262,9 +262,6 @@ probo:
     endpoint: ""
     apiKey: ""
 
-  # Search endpoint for SearXNG (optional, fallback when Firecrawl is not configured)
-  searchEndpoint: ""
-
   # Tracker mapping agent (optional, requires openai.apiKey or anthropic key)
   trackerMapping:
     provider: ""