refac: disable autocompletion by default

backend/open_webui/config.py

@@ -1307,7 +1307,7 @@ Strictly return in JSON format:
 ENABLE_AUTOCOMPLETE_GENERATION = PersistentConfig(
     "ENABLE_AUTOCOMPLETE_GENERATION",
     "task.autocomplete.enable",
-    os.environ.get("ENABLE_AUTOCOMPLETE_GENERATION", "True").lower() == "true",
+    os.environ.get("ENABLE_AUTOCOMPLETE_GENERATION", "False").lower() == "true",
 )
 
 AUTOCOMPLETE_GENERATION_INPUT_MAX_LENGTH = PersistentConfig(