feat: enhance risk pool management and role validation

- Updated AGENTS.md to streamline information on risk pool operations and agent account restrictions.
- Introduced filtering options in AdminRiskPoolIndexController for active risk pools.
- Refactored AdminRiskPoolLockLogIndexController to support grouping by ticket or entry.
- Enhanced AdminRoleStoreController and AdminRoleUpdateController to prevent the use of reserved slugs for new roles.
- Improved error messaging for role creation and updates to clarify reserved role restrictions.
- Added new API routes for ticket item retrieval to improve admin functionalities.

lang/en/admin.php

@@ -29,7 +29,7 @@ return [
     'player_has_tickets_blocks_delete' => 'Player has ticket records and cannot be deleted.',
     'player_unpaid_settlement_blocks_delete' => 'Player still has unpaid settlement bills and cannot be deleted until they are settled or written off.',
     'role_cannot_delete_super_admin' => 'Cannot delete the super admin role.',
-    'platform_roles_fixed' => 'Only the built-in Super Admin and Agent platform roles are supported; creating new roles is disabled.',
+    'role_slug_reserved' => 'This role code is reserved for a built-in role. Choose another slug.',
     'role_super_admin_permissions_fixed' => 'Super Admin always has full permissions. Run lottery:admin-auth-sync after the permission catalog changes.',
     'role_super_admin_metadata_fixed' => 'Super Admin is a built-in role; name and status cannot be changed.',
     'role_builtin_cannot_delete' => 'Built-in roles cannot be deleted.',