OPENAI_TTS_KEYにすべきところのtypoを修正

[stealthinu]

.envでOPENAI_TTS_KEYを設定していますが、パラメータ名がOPENAI_KEYにtypoしていたため設定が利用されない状況になっていました。OPENAI_API_KEYが設定されていた場合はこちらが利用されていたため問題が顕在化しなかったのではないかと思います。

Summary by CodeRabbit

• その他
  • OpenAIのテキスト読み上げ機能で利用するAPIキーの取得方法が変更されました。

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[coderabbitai]

Walkthrough

OpenAIのテキスト読み上げ（TTS）APIリクエストに使用するAPIキーの取得ロジックが変更されました。これまでOPENAI_KEYを優先していましたが、今後はOPENAI_TTS_KEYを優先し、次にOPENAI_API_KEYを参照します。他の処理やエラーハンドリングには変更ありません。

Changes

ファイル/パス	変更内容の概要
src/pages/api/openAITTS.ts	OpenAI TTS用APIキーの取得優先順位をOPENAI_KEYからOPENAI_TTS_KEYへ変更。フォールバック先はOPENAI_API_KEYのまま。

Sequence Diagram(s)

sequenceDiagram
    participant Client
    participant APIHandler
    participant OpenAI

    Client->>APIHandler: TTSリクエスト送信
    APIHandler->>APIHandler: OPENAI_TTS_KEY取得
    alt OPENAI_TTS_KEYが存在しない場合
        APIHandler->>APIHandler: OPENAI_API_KEY取得
    end
    APIHandler->>OpenAI: APIキーでTTSリクエスト
    OpenAI-->>APIHandler: レスポンス返却
    APIHandler-->>Client: レスポンス返却

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• src/pages/api/openAITTS.ts (1 hunks)

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src/pages/api/openAITTS.ts (1)

14-14: 環境変数名の修正が適切に行われています！

OPENAI_KEYからOPENAI_TTS_KEYへの変更は、環境変数の命名をより明確にし、特定の目的（テキスト読み上げ）を反映しています。これにより、.envファイルでの設定が正しく認識されるようになります。フォールバックとしてOPENAI_API_KEYを保持しているため、後方互換性も維持されています。

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[tegnike]

PRありがとうございます！
確かに変ですね、こちらの対応で問題ないのでマージしようと思います。

ただこちらですが、実は {サービス名}_API_KEY で統一しようという考えがありまして、そのうち以下のように変更する予定です。

  const openaiKey = apiKey || process.env.OPENAI_API_KEY

[stealthinu]

早速マージしていただいてありがとうございます！
確かに。あえてそこを別APIキーにする必要性はなさそうなのですものね。

[tegnike]

mainブランチへのマージはもう少しお待ち下さい！