Add UI support for room memory and space knowledge bank scopes in octos-backed rooms

[tyreseluo]

Summary

This PR adds the first Robrix UI layer for octos-backed persistent knowledge scopes:

• room-scoped memory
• space-scoped knowledge bank

It builds on the existing Matrix appservice + BotFather integration and makes persistent bot context visible and editable from the client.

What Changed

• added a client-facing representation of room memory
• added a client-facing representation of space knowledge bank state
• exposed memory/knowledge controls through Robrix UI
• kept room-scoped and space-scoped knowledge isolated
• preserved existing BotFather and appservice room binding behavior

Why

Robrix already lets users bind BotFather to a room and create/manage bots, but it does not yet expose the persistent knowledge that drives long-running bot usefulness.

This PR closes that gap by letting users manage:

• room-local bot context
• shared space-level knowledge reused across related rooms

Result

Users can now treat Robrix as the front end for both bot routing and bot knowledge management, instead of relying on hidden backend-only memory state.

Notes

This PR focuses on the first usable knowledge-management layer.

It does not introduce:

• voice workflows
• thread session/task routing
• skill/package management UX