Add hot-reload-friendly OpenAPI export

[Max347bot]

Description

Related Issues

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• 🚀 New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• ♻️ Refactor / Code Cleanup
• 📚 Documentation update
• 🔧 Infrastructure / CI / Dependency update

PR Checklist

• My code follows the code style and formatting guidelines of this project
• I have run ruff check and ruff format locally
• I have run mypy for static type checking
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally (pytest)
• Migration lint check passes (python scripts/lint_migrations.py)
• I have updated relevant documentation / OpenAPI specifications if neede

Closes #105
Closes #106
Closes #107
Closes #102