[Steam Deck] Working Configurations for Steam deck

We don't have much feedback on what works and doesn't for Umineko on Steam Deck.

## Working Configurations

- Use "Legacy runtime 1.0" option
- A user had problems where it all worked fine except the saves they made disappear, using "Proton 9.0-4"
- I told them to try "steam linux runtime" (No proton) and it didn't fix it
- Finally they tried using "Legacy runtime 1.0" and their saves worked as normal.

## Not working configurations

- "Proton 9.0-4"
- "Steam Linux Runtime" ?

該 issue 是關於為《海貓鳴泣之時》遊戲記錄 Steam Deck 相容性。首先閱讀現有 issue 正文，以了解報告的有效和無效配置。在儲存庫中查找任何現有的文件檔案，例如 README.md 或 docs/ 資料夾，以確定應在何處新增此資訊。任務是將給定的回饋整理成一個清晰的章節，很可能是在相容性或安裝指南中。驗證結構並確保資訊清晰呈現給使用者。

由索引模型根據 Issue 內容生成。