- add `src/core/modules/` with registry, discovery (server), and public index
- add `src/core/public-pages/` with registry, server component, and public index
- add `src/core/users/permissions-registry.js` for runtime permission registration
- expose `./modules`, `./public-pages`, and `./public-pages/server` package exports
- rename `registerFeatureRoutes` to `registerApiRoutes` with backward-compatible alias
- extend `seedDefaultRolesAndPermissions` to include module-registered permissions
- update `initializeZen` and shared init to wire module discovery and registration
- add `docs/MODULES.md` documenting the `@zen/module-*` authoring contract
- update `docs/DEV.md` with references to module system docs
- add optional `permission` field to `registerWidget` api
- filter widgets in `DashboardPage` based on user permissions
- register users widget with `users.view` permission requirement
- document `permission` parameter in admin README
- add optional `permission` field to nav items in registry
- filter nav items by user permissions in `buildNavigationSections`
- auto-hide sections when all their items are filtered out
- fetch user permissions in `AdminLayout.server.js` and pass to navigation builder
- update docs and README to document `permission` param and new signature
- add `createAccountSetup`, `verifyAccountSetupToken`, `deleteAccountSetupToken` to verifications core
- add `completeAccountSetup` function to auth core for password creation on invite
- add `InvitationEmail` template for sending invite links
- add `SetupAccountPage` client page for invited users to set their password
- add `UserCreateModal` admin component to invite new users
- wire invitation action and API endpoint in auth feature
- update admin `UsersPage` to include user creation modal
- update auth and admin README docs
hykocx