Add owner_id to agent_runtime table to track who registered each runtime.
Backend: new delete endpoint with role-based permissions (owner/admin can
delete any, members only their own), list filtering by owner (?owner=me),
and agent dependency check before deletion.
Frontend: Mine/All filter toggle in runtime list, owner display in list
items and detail view, delete button with AlertDialog confirmation.
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
