feat: add WEB_SEARCH_RESULT_COUNT to control max number of results

backend/config.py

@@ -549,6 +549,7 @@ BRAVE_SEARCH_API_KEY = os.getenv("BRAVE_SEARCH_API_KEY", "")
 SERPSTACK_API_KEY = os.getenv("SERPSTACK_API_KEY", "")
 SERPSTACK_HTTPS = os.getenv("SERPSTACK_HTTPS", "True").lower() == "true"
 SERPER_API_KEY = os.getenv("SERPER_API_KEY", "")
+WEB_SEARCH_RESULT_COUNT = int(os.getenv("WEB_SEARCH_RESULT_COUNT", "10"))
 
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 # Transcribe