Add admin panel for superadmin users

[jhash]

Summary

• Added a comprehensive admin panel accessible only by superadmin users
• Implemented full CRUD operations for Users and Roles models
• Created dynamic, reusable components that automatically adapt to model attribute changes

Features

• Admin Authentication: Created Admin::BaseController that ensures only superadmin users can access admin panel
• Dynamic Views: Built with ViewComponent for reusable UI components
• Model Management:
  • Users: Full CRUD with ability to grant/revoke superadmin status
  • Roles: Full CRUD operations
• Smart Components:
  • FormFieldComponent: Automatically renders appropriate form fields based on attribute type
  • ModelTableComponent: Dynamically displays model data in tables
• UX Enhancements:
  • Auto-dismissing flash messages with Stimulus
  • Responsive Tailwind CSS design
  • Sidebar navigation for easy model switching

Test plan

• Login as a superadmin user
• Navigate to /admin
• Test Users CRUD operations:
  • View users list
  • Create a new user
  • Edit existing user
  • Toggle superadmin status
  • Delete a user
• Test Roles CRUD operations:
  • View roles list
  • Create a new role
  • Edit existing role
  • Delete a role
• Verify non-superadmin users cannot access admin panel
• Test flash message auto-dismiss functionality
• Verify dynamic field rendering works for all attribute types

🤖 Generated with Claude Code