[Feat] DB (MySQL) 추가 및 `models`, `repositories`, `services` layer 개발

[Zerohertz]

Is your feature request related to a problem? Please describe.

X

Describe the solution you'd like

• DB (MySQL) manifest 추가 및 연결
• models, repositories, services layer 개발
  • SQLModel SQLAlchemy 사용
• Dependency injection 사용

Describe alternatives you've considered

X

Additional context

X