Path	Copy into	Example of
`plugins/scheduling/`	`plugins/scheduling/`	The reference plugin: a list page over an upstream REST service, a CSRF-guarded form that forwards a write, and permission-gated nav — built from the core building blocks, holding no state. Imports the host surface as `#plugin-api`. See its README and the plugin contract.
`plugins/admin/`	`plugins/admin/`	The system-admin plugin: the Users / Groups / Roles / OAuth2-clients screens for running Plainpages itself. A system plugin — it administers the Ory identity stack via the privileged `ctx.system` surface instead of its own upstream. Copy it in to get a GUI for user & group admin. See its README.
`config/menu.ts`	`config/menu.ts`	The central menu override + branding template (rename/group/order/hide nav, set app name/logo/theme). Imports its typed builder as `#menu-config`; `config/` ships empty, so defaults apply until you copy this in. See The menu system.
`shifts-upstream/`	— (dev service)	A throwaway mock backend the reference plugin reads/writes — stdlib-only, in-memory, no auth. Stands in for your real service so `docker compose up` shows the plugin working out of the box; in production you point `SCHEDULING_UPSTREAM` at the real thing instead.