HotFix: only check for refresh token

[Ruthgyeul]

#️⃣ Related Issue

#102

📝 PR Description

미들웨어, 리프레시 토큰 존재 유무만 체크로 변경

[Copilot]

Pull Request Overview

This PR implements a hotfix to change the middleware logic so that only the refresh token is checked for protecting certain paths.

• Removed access token extraction and refresh API call logic.
• Simplified the middleware to only redirect when the refresh token is missing.

Comments suppressed due to low confidence (1)

src/middleware.ts:3

• API_BASE_URL is defined but not used in the new logic. Consider removing it if it is no longer needed to reduce confusion.

const API_BASE_URL = process.env.NEXT_PUBLIC_BASE_API_URL;