5ff2e2e74c
Hard cutover from the browser-extension plugin flow to desktop clients: remove plugin_installations/plugin_sessions tables and related service, handler, router, and generated model code; migrate monitoring quotas and collector types to desktop_clients (UUID primary_client_id); recreate platform_access_snapshots keyed by client_id; update dev-seed and callback types accordingly; mark legacy design docs as historical. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>