[task] MVC 패턴에 따른 디렉토리 구축

### ISSUE
- Group: `server`
-Type: `feature`
-Detail: MVC 패턴에 따른 디렉토리 구축

### TODO
1. [x] MVC 패턴에 따른 디렉토리 구축
2. [x] 맞게 구축했는지 점검해보자

### Estimated time
>Pick one

### `1h`

The issue identifies the server group and asks for an MVC-based directory structure, but names no files, tests, or entry points. Start by inspecting the server directory and its current layout. Done means the MVC structure is present and the directory check described in the issue passes.

由索引模型根据 Issue 内容生成。