[task] sequalize : db 테이블 작성(models)

### ISSUE
- Group: `server`
-Type: `feature`
-Detail: sequalize로 db테이블 작성
더미데이터 추가 가능하면 하기(advanced)
### TODO
1. [ ] sequalize에 models 작성

### Estimated time
>Pick one

### `1h`

Start in the server group's Sequelize setup and locate the existing model definitions or database configuration. Determine which tables and fields are required from the surrounding project context, then add the Sequelize models and verify they load correctly. Adding dummy data is explicitly optional.

Written by the indexing model from the issue text.