fix: stop sending count to the Staan search API (#30303)

Staan rejects any count other than its fixed page size of 10, so every search 400ed with the default result count of 3. The API always returns 10 results; the local results[:count] slice already applies the configured count, so the request parameter is simply dropped.

backend/open_webui/retrieval/web/staan.py

@@ -30,7 +30,7 @@ def search_staan(
         'Accept': 'application/json',
         'Authorization': f'Bearer {api_key}',
     }
-    params = {'q': query, 'market': market, 'count': count}
+    params = {'q': query, 'market': market}
 
     if max_snippets:
         params['extra_snippets'] = 'true'