feat: Cronトリガーノードを追加

[oboroge0]

Summary

• Cron式でスケジュール実行するトリガーノードを新規追加
• 標準5フィールドcron式に対応（分 時 日 月 曜日）
• 外部ライブラリ不要の軽量cronパーサーを内蔵
• タイムゾーン設定・有効/無効切り替え対応

cron式の例

式	説明
0 * * * *	毎時0分
0 9 * * *	毎日9:00
0 9 * * 1	毎週月曜9:00
*/5 * * * *	5分ごと
0 9,18 * * 1-5	平日9時と18時

変更内容

• plugins/cron-trigger/ — プラグイン本体（manifest.json + node.ts）
• apps/server-ts/src/engine/plugin-loader.ts — SOURCE_NODE_TYPESに追加
• apps/web/locales/{en,ja}.json — ローカライズ追加
• tests/plugins/cron-trigger.test.ts — cronパーサーのユニットテスト

Test plan

• npm test — 全116テスト通過
• bun test tests/plugins/ — cronパーサーテスト9件通過
• npm run lint — 新規エラーなし
• Cronトリガーノードを追加し、cron式設定UIが表示されることを確認
• */1 * * * *（毎分）で設定し、1分ごとにトリガーが発火することを確認

closes #64

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Reviewing files that changed from the base of the PR and between b45d01e and 75fb1be.

📒 Files selected for processing (6)

• apps/server-ts/src/engine/plugin-loader.ts
• apps/web/locales/en.json
• apps/web/locales/ja.json
• plugins/cron-trigger/manifest.json
• plugins/cron-trigger/node.ts
• tests/plugins/cron-trigger.test.ts

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• Commit unit tests in branch feat/cron-trigger

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