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。

FEATURES.md

@@ -60,8 +60,8 @@ otherwise.
   supervision, unified Runtime monitoring, managed processes, safe static HTML
   preview, target-pinnable workspace/browser/artifact instances, bottom
   docking, and separate windows. Task Center remains the singleton Task index;
-  attachments and knowledge remain in the conversation composer, while future
-  memory and historical execution context belong to the associated Task. See
+  attachments and knowledge remain in the conversation composer, while memory,
+  when implemented, and historical execution context belong to the associated Task. See
   the [Feature PRD](./docs/features/assistant-workbar/prd.md).
 
 ### Agent Runtimes and model connections
@@ -432,8 +432,8 @@ otherwise.
   created and edited for Global or one or more selected Projects. Legacy
   single-project settings migrate without loss, and project-level memory and
   action output must explicitly target a Project in scope. Task Center and
-  Settings no longer duplicate the form. Future partitioned memory remains an
-  independently designed long-term direction. See the
+  Settings no longer duplicate the form. Partition-aware review, candidate
+  generation, and recall triggers remain to be designed. See the
   [Smart Heartbeat PRD](./docs/features/smart-heartbeat/prd.md).
 - [ ] **General supervision** (planned): Uses a fixed supervision section to
   observe user-selected conversations, Tasks, automations, or experiments and