feat: SillyTavern parity Phase 1（多 API 路由 / 宏引擎接入 / 推理内容展示） - #3

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Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: gradle/actions/wrapper-validation@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/