Use `logging.getLevelNamesMapping()` for getting all valid logging levels. This also allows adding new ones using `logging.addLevel()`. This feature was [added](https://docs.python.org/3.11/library/logging.html#logging.getLevelNamesMapping) in Python 3.11 which is above the minimum supported Python version for open-webui.
Introducing two new env config options to control cookies settings regarding
authentication. These values are taken into use when setting 'token' and 'oauth_id_token'.
To maintain backwards compatibility, the original session cookie values are used as
fallback.
Separation is done to prevent issues with the session cookie. When the config value was
set as 'strict', the oauth flow was broken (since the session cookie was not provided
after the callback).
Providing a separate config for auth & session cookies allows us to keep the 'strict'
settings for auth related cookies, while also allowing the session cookie to behave as
intended (e.g., by configuring it as 'lax').
The original config was added in commit #af4f8aa. However a later commit #a2e889c reused
this config option for other type of cookies, which was not the original intent.
Related to #7207
Modify the code to allow the docker container to start in an offline environment for versions >= 0.4.0.
* **backend/open_webui/retrieval/utils.py**
- Import `OFFLINE_MODE` from `open_webui.env`.
- Set `local_files_only` to `True` when `OFFLINE_MODE` is enabled in `snapshot_kwargs`.
* **backend/open_webui/env.py**
- Add logic to set `HF_HUB_OFFLINE` environment variable to `1` when `OFFLINE_MODE` is enabled.
* **README.md**
- Document setting `HF_HUB_OFFLINE` environment variable to `1` for offline environments.
