feat: add ShareServer console prototype

ShareServer previously existed only as design documents. The repository now includes a standalone Hono service and a responsive React management-console prototype covering administrator and member workflows, with local build, test, and container entry points.

The sharing design now includes organization-scoped digital agents and explicit local partitioned-memory selection for @ calls. Memory documentation consistently uses partitioned memory and treats time or internal events only as optional recall triggers.

This remains an interactive prototype: fixture actions do not persist, and production authentication, PostgreSQL isolation, device connections, routing, relay, and federation still require implementation.

Release note: 新增可独立运行的 ShareServer 管理控制台交互原型，并完善组织数字人与分区记忆共享设计；当前原型数据和操作不会写入生产系统。

UI-DESIGN.md

@@ -640,7 +640,7 @@ GoodBuddy 是可调整窗口大小的桌面应用。响应式设计优先保证
 - 状态卡片使用统一状态令牌，不只依赖颜色。
 - 保留“运行概览 / 待处理建议 / 报告与记录 / 心跳计划”四个同级页面。
 - 智能心跳菜单入口是完整配置的权威位置；任务中心和设置中心不得复制同一 CRUD 表单。
-- “未来分区记忆”仅为长期方向，数据、状态和页面尚未设计，不得显示占位入口。
+- 分区记忆协同与唤起条件尚未实现，不得显示占位入口或平行的记忆类型。
 
 ### 13.5 Task Center