Add RBAC, convert existing roles

app/controllers/application_controller.rb

app/models/permission.rb

app/models/role.rb

app/models/role_permission.rb

app/models/user.rb

app/models/user_role.rb

db/migrate/20250304094401_create_roles.rb

db/migrate/20250304094406_create_user_roles.rb

db/migrate/20250304094410_create_permissions.rb

db/migrate/20250304094414_create_role_permissions.rb

db/migrate/20250304101405_migrate_to_rbac_system.rb

...rate/20250304110959_remove_shiftcoordinator_from_users.rb