Add Celesto CLI auth commands with secure key storage

[aniketmaurya]

Summary

• Added celesto auth login, celesto auth status, and celesto auth logout for reusable CLI authentication
• Store API keys in the OS credential store via keyring, scoped by Celesto base URL
• Updated CLI/API-key resolution to reuse saved credentials after --api-key, env vars, and .env
• Added README guidance and tests for the new auth flow and secure-store fallback

Testing

• uv run celesto auth --help
• uv run celesto auth login --help
• uv run celesto auth status
• uv run ruff check .
• uv run pytest
• npm run lint
• npm test

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: da2c33af-5187-468f-9b10-ded719423f67

📥 Commits

Reviewing files that changed from the base of the PR and between 9ddd266 and 92a5e12.

📒 Files selected for processing (6)

• README.md
• pyproject.toml
• src/celesto/auth.py
• src/celesto/deployment.py
• src/celesto/main.py
• tests/test_auth.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/auth-login

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[mintlify]

Docs PR opened: CelestoAI/mintlify-docs#101

Documented the new celesto auth login, status, and logout CLI commands for saving and managing API keys securely.