Harden private search fallback and freshness handling

platform/web-search/searxng-settings.example.yml

@@ -20,3 +20,13 @@ server:
 outgoing:
   request_timeout: 8.0
   max_request_timeout: 15.0
+
+# Several default general-purpose engines aggressively block datacenter IPs.
+# Bing is disabled in SearXNG's upstream defaults but works reliably from the
+# Athena egress path.  Explicitly enabling it gives the private metasearch a
+# useful primary engine while the others remain independent fallbacks.
+engines:
+  - name: bing
+    engine: bing
+    shortcut: bi
+    disabled: false