Function GET

Returns Promise<
    | NextResponse<
        {
            totalMaintenances: number;
            completedMaintenances: number;
            plannedMaintenances: number;
            inProgressMaintenances: number;
            overdueMaintenances: number;
            upcomingMaintenances: number;
            equipmentNeedingMaintenance: number;
            totalCost: number;
            totalDuration: number;
            averageCost: number;
            averageDuration: number;
            maintenanceByType: { type: string; count: number }[];
            maintenanceByStatus: { status: string; count: number }[];
            maintenanceByPriority: { priority: string; count: number }[];
        },
    >
    | NextResponse<{ error: string }>,
>