fix(web-search): support Exa baseUrl

docs/tools/exa-search.md

@@ -38,6 +38,7 @@ extraction (highlights, text, summaries).
         config: {
           webSearch: {
             apiKey: "exa-...", // optional if EXA_API_KEY is set
+            baseUrl: "https://api.exa.ai", // optional; OpenClaw appends /search
           },
         },
       },
@@ -56,6 +57,14 @@ extraction (highlights, text, summaries).
 **Environment alternative:** set `EXA_API_KEY` in the Gateway environment.
 For a gateway install, put it in `~/.openclaw/.env`.
 
+## Base URL override
+
+Set `plugins.entries.exa.config.webSearch.baseUrl` when Exa search requests
+should go through a compatible proxy or alternate Exa endpoint. OpenClaw
+normalizes bare hosts by prepending `https://` and appends `/search` unless the
+path already ends there. The resolved endpoint is included in the search cache
+key, so results from different Exa endpoints are not shared.
+
 ## Tool parameters
 
 <ParamField path="query" type="string" required>