[Feat] 아이디어 리스트 페이지 api 연결

[GraceKim527]

🛠 Issue

아이디어 리스트 페이지에서 필요한 api를 연결합니다.

📝 To-do

• 아이디어 주제 불러와서 dropdown에 넣기
• 페이지네이션 구현
• 리스트 api 구현

[rena-ertam028]

Hello, we tried to solve the issue.

This is what we did:

1. Added API integration for fetching idea subjects
2. Implemented pagination with real data
3. Added loading states and error handling
4. Removed mock data and connected real API endpoints

You can review changes in this commit: rena-ertam028@4cd5e27.

Caution

Disclaimer: The concept of solution was created by AI and you should never copy paste this code before you check the correctness of generated code. Solution might not be complete, you should use this code as an inspiration only.

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