feat: add configurable user_env persistence to database

[ayylemao]

From #2335
Simple clear of user env before writing to db with .chainlit/config.toml default parameter

Also changed: API key fields in frontend are now masked for improved security.

[hayescode]

@ayylemao I feel like this should be user controllable

[ayylemao]

@ayylemao I feel like this should be user controllable

Makes sense.
Both are now options in the config.toml:

# Set to true to store user env vars in DB, false to exclude them for security
persist_user_env = false

# Whether to mask user environment variables (API keys) in the UI with password type
# Set to true to show API keys as ***, false to show them as plain text
mask_user_env = false

[ayylemao]

I have resolved the conflicts.
Can you review it and then merge and close?
@hayescode
Regards

[hayescode]

@ayylemao small ruff formatting issue.

[ayylemao]

If i run ruff locally with uv run ruff in the backend forlder i get that all checks pass.
Could you help me finding out whats wrong so we can get this PR finnally closed? 😄
@hayescode

[hayescode]

Try running the commands from the CI like uv run ruff format --check and run uv format .

https://github.com/Chainlit/chainlit/blob/main/.github%2Fworkflows%2Flint-backend.yaml#L24-L32

[ayylemao]

i hope this last commit fixes it
@hayescode