feat: AivisSpeech・OpenAI TTSプラグインを追加

[oboroge0]

Summary

• AivisSpeech TTSプラグインを新規追加（VOICEVOX互換API、デフォルト: localhost:10101）
• OpenAI TTSプラグインを新規追加（tts-1/tts-1-hd/gpt-4o-mini-ttsモデル、10種類のボイス）
• グローバル設定画面にAivisSpeechホスト設定を追加
• OpenAI TTSはOpenAI APIキーのグローバル設定を共有

変更内容

• plugins/aivis-tts/ — AivisSpeechプラグイン本体
• plugins/openai-tts/ — OpenAI TTSプラグイン本体
• apps/server-ts/src/engine/executor.ts — グローバル設定マッピング追加
• apps/web/components/ui/SettingsModal.tsx — 設定画面にAivisSpeechセクション追加
• apps/web/components/panels/NodeSettings.tsx — ノード設定パネル対応
• apps/web/locales/{en,ja}.json — ローカライズ追加

Test plan

• npm test — 全116テスト通過
• npm run lint — 新規エラーなし
• AivisSpeech TTSノードを追加し、話者選択・音声生成が動作することを確認
• OpenAI TTSノードを追加し、ボイス選択・音声生成が動作することを確認
• グローバル設定でAivisSpeechホストを設定し、ノードに反映されることを確認

closes #92 (AivisSpeech・OpenAI TTS部分)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3d60bcef-ab95-42d7-a139-9a36bdc899cf

📥 Commits

Reviewing files that changed from the base of the PR and between b45d01e and 018f830.

📒 Files selected for processing (9)

• apps/server-ts/src/engine/executor.ts
• apps/web/components/panels/NodeSettings.tsx
• apps/web/components/ui/SettingsModal.tsx
• apps/web/locales/en.json
• apps/web/locales/ja.json
• plugins/aivis-tts/manifest.json
• plugins/aivis-tts/node.ts
• plugins/openai-tts/manifest.json
• plugins/openai-tts/node.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/tts-expansion

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