deprecate(oapi): GET /words, /list/user/:userId & /list/word/:word

[Pugma]

as titled

[YuHima03]

コメントしたので確認していただけると嬉しいです 🙇

[Copilot]

Pull Request Overview

This PR deprecates three API endpoints by replacing their implementation with HTTP 410 Gone responses, indicating these endpoints are no longer available.

• Deprecates GET /words endpoint that previously returned all word data
• Deprecates GET /list/user/{userId} endpoint that returned words for a specific user
• Deprecates GET /list/word/{word} endpoint that returned users viewing a specific word

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
server/oapi/words.go	Replaces GetWords implementation with HTTP 410 Gone response
server/oapi/list.go	Replaces GetListUserUserId and GetListWordWord implementations with HTTP 410 Gone responses

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}