Add a minimal payment mock server for end-to-end testing

apps/edr-freight-web/portal/src/pages/bookings/BookingDetailPage/ReadonlyBookingView.tsx

@@ -1,7 +1,5 @@
 import { Group, Tabs } from "@mantine/core";
-import { useMutation, useQuery } from "@tanstack/react-query";
 import { Clock, CreditCard, FileText, LayoutGrid, Truck } from "lucide-react";
-import { useState } from "react";
 import { useNavigate } from "react-router-dom";
 
 import { useFileViewer } from "@/hooks/useFileViewer";