feat: add Paper Routes and package five design systems

Add the paper direction with thin tracks, outlined hexagons and line arrows, without exterior color markers or piece numbers. Add a unified catalog for five designs and their 25 themes, with direct review links.

Organize each design into an authored design.md, generated tokens.json and preview. Add Agent routing, shared integration guidance, a machine-readable manifest and an executable rendering example. Preserve legacy preview and document links.

Validation: 16 focused design, theme and package tests passed; npm run design and static build passed. Confirmed all eight authored documents survive generation unchanged. Browser checks covered mobile, tablet and desktop layouts, theme links and migrated previews. Native engine integration and visual verification remain pending.

README.md

@@ -29,6 +29,7 @@ npm run dev
 - [千关审核页](http://localhost:4173/labs/campaign-review/index.html)：按章看布局，检查制作证据，逐步回放和导出本章总览。
 - [花形轨道测试](http://localhost:4173/labs/flower/index.html)：双层十二瓣与三重环带编织成花，包含 10 枚棋子的独立可玩实验，详见 [设计说明](docs/flower-study.md)。
 - [交互设计规范](http://localhost:4173/Design.html)：色板、图标、组件状态与动效示例。
+- [设计方案总览](http://localhost:4173/design/index.html)：01–05 五套设计、25 种主题、完整设计稿与多选审核入口；最新为「轻线纸境」。[方案目录](design/README.md)记录各套特点与共用规则。
 - 修改端口：`PORT=4174 npm run dev`。
 
 ## 游戏规则
@@ -118,6 +119,8 @@ v0.5 的编排在 `src/production-plan.js`，选中配方在 `levels/v0.5-recipe
 
 [Design.md](Design.md) 记录设计规范；[Design.html](Design.html) 内嵌图片与样式，可单文件离线分享。生成过程与提示词见 [素材说明](assets/GENERATION.md)。
 
+五套独立设计的 Agent 入口是 [design/README.md](design/README.md)，共用接入规则见 [design/shared.md](design/shared.md)。每套在 `design/directions/<id>/` 下提供人工维护的 `design.md`、生成的 `tokens.json` 和预览 `index.html`；[manifest.json](design/manifest.json) 提供可编程读取的目录。使用方案时复用共享 JS/CSS，基础 Design.md 不包含各套的全部独立规则。
+
 Cocos 示例复用规则、碰撞、渲染命令和图集；HTML 控件、文件导入导出与存储需替换成宿主接口。接入步骤见 [Cocos 移植指南](docs/cocos-port.md)。`wechat/HexTrail/` 是本仓库管理的 Cocos Creator 3.8.8 工程，后续将把当前游戏移植到该工程中。使用 Creator 打开该目录；工程自身的 `.gitignore` 排除缓存、本地配置和构建产物，源码与项目配置随主仓库提交。
 
 ## 验证与已知限制