docs(i1): engineering index, parallel tracks, and product context

Add PARALLEL_ITERATION_INDEX, workspace layout, system architecture,
three-track execution packs, BPM/product references, and planned
service manifests. Supports I1 alignment across backend, web, and SDK.

Made-with: Cursor

engineering/planned/delivery-platform-ui/README.md

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+# delivery-platform-ui（规划）
+
+## 职责
+
+客户商务与交付管理平台 **SPA**：Vue 3 + Vite；对接 `delivery-platform-api` 的 OpenAPI；实现 [产品模块文档](../../../docs/chuangfei-platform-product-modules.md) 所列界面与权限（路由 meta + 后端 RBAC）。
+
+## 与本工作区关系
+
+- 无代码依赖；**文档与排期**见 [BPM 与 Roadmap](../../../docs/chuangfei-platform-bpm-and-roadmap.md)。
+
+## 仓库建议名
+
+`craftlabs-delivery-platform-ui`