feat: lint backend code with ruff and fix issues

[ayahaustine]

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[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: b599a52b-6473-4b7e-abd1-724897aa3b75

📥 Commits

Reviewing files that changed from the base of the PR and between 0f6479f and 2d866f5.

📒 Files selected for processing (18)

• backend/core/config.py
• backend/core/dependencies.py
• backend/core/security.py
• backend/db/base.py
• backend/modules/auth/models.py
• backend/modules/auth/repository.py
• backend/modules/auth/router.py
• backend/modules/auth/schemas.py
• backend/modules/auth/service.py
• backend/modules/users/models.py
• backend/modules/users/repository.py
• backend/modules/users/router.py
• backend/modules/users/service.py
• backend/pyproject.toml
• backend/tests/conftest.py
• backend/tests/test_auth.py
• backend/tests/test_health.py
• backend/tests/test_security.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch dev

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