- Introduced `pyproject.toml` to centralize backend tool configurations (e.g., Ruff, mypy, coverage, pytest).
- Replaced Black, isort, and Flake8 with Ruff for linting, formatting, and import sorting.
- Updated `requirements.txt` to include Ruff and remove replaced tools.
- Added `Makefile` to streamline development workflows with commands for linting, formatting, type-checking, testing, and cleanup.
- Mark unreachable code paths in `validators.py` and `base.py` with `# pragma: no cover` for coverage accuracy.
- Add comments to clarify defensive code's purpose and usage across methods.
- Added reusable validation functions (`validate_password_strength`, `validate_phone_number`, etc.) to centralize schema validation in `validators.py`.
- Updated `schemas/users.py` to use shared validators, simplifying and unifying validation logic.
- Introduced new error codes (`AUTH_007`, `SYS_005`) for enhanced error specificity.
- Refactored exception handling in admin routes to use more appropriate error types (`AuthorizationError`, `DuplicateError`).
- Improved organization query performance by replacing N+1 queries with optimized methods for member counts and data aggregation.
- Strengthened security in JWT decoding to prevent algorithm confusion attacks, with strict validation of required claims and algorithm enforcement.
