feat(1.x.x): PDF 高保真巡检闭环收敛 + 定义源 SSOT 入库 + 科普视频/动效生产线成型 + 全站 UI 规范对齐（81 提交聚合） - #1124

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, astral-sh/setup-uv@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/