docs(ts): 重组 Polaris 设计文档体系并迁移至 nextjs 目录

- 拆分为项目说明/首页设计/分类页设计三份文档，职责分离 - 新增项目说明文档：14 条决策记录、技术选型（Next.js 静态导出）、数据结构、Go API 草案、通用语法表结构、五阶段规划 - 融入决策：JSON 数据载体、Ctrl+K 仅首页生效、统一图标方案（si:/local:/url: 前缀 + 四级 fallback）、搜索按模式严格分离、首页补足 8 个常用链接（跨分类归属） - 目录 ts/web/astro/polaris → ts/web/nextjs/polaris，删除过时 README，更新 ts/README.md 框架描述
2026-08-21 22:08:14 +08:00
parent 86182ce5d7
commit 95c3da0f71
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