chore: remove rich dependency to stabilize installs

[nipudarsh]

Motivation

• Tests in CI were failing during dependency installation due to the optional rich runtime dependency, so runtime dependencies were reduced to improve install reliability in constrained environments.

Description

• Removed rich from runtime dependencies in pyproject.toml and requirements.txt to avoid install-time failures.
• Replaced rich imports and Console usage with click.echo in CLI modules to preserve UX without the extra dependency, touching angel_cli/cli.py, angel_cli/commands/auth.py, angel_cli/commands/tools.py, angel_cli/commands/repos.py, angel_cli/commands/maintenance.py, and angel_cli/commands/config.py.
• Committed the changes under the message chore: drop rich dependency so the package metadata and CLI are consistent with the simplified dependency set.

Testing

• No automated tests were executed locally because dependency installation is blocked in the environment, so pytest was not run here (tests remain in the repo and will run in CI once dependencies install successfully).

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