* feat: multi-backend support with cloud SaaS proxy routing
* feat: route conversation export through cloud proxy on cloud backends
* fix: route conversation delete through cloud proxy on cloud backends
* fix: forward settings diffs verbatim through cloud proxy save
* fix: surface cloud-aware settings sub-pages and gate local-only routes
* fix: route secrets settings through cloud proxy on cloud backends
* fix: route conversation stop runtime through cloud proxy on cloud backends
* fix: re-expose planning agent UI for cloud backends and route plan file reads through cloud proxy
* fix: route Display Cost runtime fetch through cloud proxy and ungate local metrics without session API key
* fix: handle WAITING_FOR_SANDBOX task status from cloud backends to prevent UI crash
* fix: re-expose Public Share in conversation menu for cloud backends
* fix: redirect to home when switching backends from a conversation page
* fix: hide cloud orgs the API key can't access in backend selector
* feat: support running multiple local agent-servers with shared persistence
* fix: lint
* fix: failing tests
