docs: integrate unified plugin workspace

.project-docs/40-domain/business-rules.md

@@ -56,9 +56,10 @@
   never run. Pi extensions execute with desktop-user authority after that fact is shown
   in confirmation. New and idle parent workers refresh automatically, active parents
   switch only after settlement, and child workers never inherit Device Package resources.
-- Device Packages appear separately from Official Plugins in My Plugins and never enter
-  Account Library, Marketplace Package Store, Release, Channel, Admission, project
-  enablement, Agent assignment, or server billing state.
+- Device Packages appear as a separate `本机` source beside Official Plugins in the
+  unified `/plugins` workspace and never enter Account Library, Marketplace Package
+  Store, Release, Channel, Admission, project enablement, Agent assignment, or server
+  billing state.
 - 面向用户的 AI 编程新建流程必须在 `mini_game`、`mini_program`、`custom` 中选择；`ProjectType` 是产品类型，创建后不能通过 UI 或 Host API 修改，未传类型的兼容 API 调用按 `custom` 处理。
 - 新建小游戏和小程序会生成平台固定版本的受控 Vite 发布模板，并可使用项目配置中的单一“提交审核”入口；`custom` 和缺少类型字段的旧项目不提供一键发布。
 - `ProjectType` 不等于 `BuildPreset`：第一期两个可发布产品类型都映射到内部受控 Vite preset；本地 `projectType` 不是授权边界，Main-owned 安全打包、Host API 和服务端包体校验仍必须执行。
@@ -138,4 +139,4 @@
 
 ## Last Reviewed
 
-2026-08-31
+2026-09-03