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.

app/Http/Controllers/Api/V1/Admin/User/AdminRoleUpdateController.php

@@ -39,7 +39,21 @@ final class AdminRoleUpdateController extends Controller
             }
         }
         if (isset($payload['slug'])) {
-            $payload['code'] = $payload['slug'];
+            $nextSlug = strtolower(trim((string) $payload['slug']));
+            if (
+                PlatformSystemRoles::isFixedSlug($nextSlug)
+                && $nextSlug !== (string) $admin_role->slug
+            ) {
+                return ApiMessage::errorResponse(
+                    $request,
+                    'admin.role_slug_reserved',
+                    ErrorCode::ValidationFailed->value,
+                    ['slug' => $nextSlug],
+                    422,
+                );
+            }
+            $payload['slug'] = $nextSlug;
+            $payload['code'] = $nextSlug;
         }
 
         $admin_role->fill($payload);