Add Dockerized app and multi-user Chainlit auth

[AminMahpour]

Summary

• Add a Docker image and compose app service for running ChainAgents with the existing Postgres service
• Add a local JSON-backed Chainlit user store with salted password hashes and support for add/list/remove flows
• Wire Chainlit auth to the user store while keeping the legacy single-user env vars as a fallback
• Update README and deployment tests to cover the new container and auth workflows

Testing

• Added unit coverage for the user store, CLI user management commands, and auth routing
• Added deployment tests for the Docker image and compose configuration
• Full test suite passed locally

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Wrap users-file I/O failures in UserStoreError

load_user_store only translates JSONDecodeError, so when CHAINLIT_AUTH_USERS_FILE points to an unreadable path or a directory, users_file.read_text() raises an OSError (for example PermissionError/IsADirectoryError) that bypasses the existing callers’ error handling (authenticate_user and run_users_cli only catch UserStoreError). In those cases, login attempts and chainagents users commands terminate with an unhandled exception instead of returning a clean auth failure or CLI error.

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