refactor: migrate to uv

[luk-kop]

Project Structure

• Migrated to uv workspaces - moved Lambda to lambdas/certbot/
• Replaced pip with uv across CI and Terraform
• Consolidated dependencies: removed requirements.txt, requirements-dev.txt

Lambda Code

• Added botocore.exceptions.ClientError to exception handling
• Fixed empty secret handling (first run no longer errors)
• Added type hints (TypedDict, Callable) and improved docstrings

Terraform

• Scoped CloudWatch Logs IAM policy to specific log group
• Fixed Lambda layer architecture mismatch (dynamic platform build)
• Removed unused null provider
• Updated paths for new lambdas/certbot/ structure

CI/CD

• Switched to uv sync / uv run for faster builds
• Removed stale --cov=new_stake_script reference

Docs

• Added "View Lambda logs" CLI examples
• Added "Adding a New Lambda" guide
• Updated all paths and instructions for uv/workspace

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