implement /setup and /admin

docs/ADMIN.md

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+# Admin Dashboard
+
+The admin dashboard provides tools for managing users, invitations, and viewing system statistics.
+
+## Creating the First Admin User
+
+Visit /setup
+
+## Accessing the Admin Dashboard
+
+1. **Note:** Authentication system is not yet implemented. You'll need to set `session[:user_id]` manually in the console or implement the authentication controllers first.
+
+2. Once authenticated, navigate to `/admin` to access the dashboard.
+
+## Admin Features
+
+### Dashboard (`/admin`)
+- View system statistics (users, entries, suggestions)
+- Language completion percentages
+- Recent activity (new users, new entries)
+- Pending invitations count
+
+### User Management (`/admin/users`)
+- List all users with filtering
+- Edit user details and roles
+- Delete users (except yourself)
+- View user status (active/invited)
+
+### Invitations (`/admin/invitations`)
+- Send new invitations
+- View pending invitations (not yet accepted)
+- Cancel pending invitations
+- View recently accepted invitations
+- Invitations expire after 14 days