Add RAG_WEB_LOADER + Playwright mode + improve stability of search

backend/open_webui/config.py

@@ -1712,6 +1712,11 @@ RAG_WEB_SEARCH_CONCURRENT_REQUESTS = PersistentConfig(
     int(os.getenv("RAG_WEB_SEARCH_CONCURRENT_REQUESTS", "10")),
 )
 
+RAG_WEB_LOADER = PersistentConfig(
+    "RAG_WEB_LOADER",
+    "rag.web.loader",
+    os.environ.get("RAG_WEB_LOADER", "safe_web")
+)
 
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 # Images