refac: disable ENABLE_REALTIME_CHAT_SAVE by default

backend/open_webui/env.py

@@ -313,7 +313,7 @@ RESET_CONFIG_ON_START = (
 
 
 ENABLE_REALTIME_CHAT_SAVE = (
-    os.environ.get("ENABLE_REALTIME_CHAT_SAVE", "True").lower() == "true"
+    os.environ.get("ENABLE_REALTIME_CHAT_SAVE", "False").lower() == "true"
 )
 
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