add booking request functionality for GENERAL customs contracts

- Create migration for booking_requests table with necessary fields and indexes.
- Implement BookingRequestRepository for database operations related to booking requests.
- Develop BookingRequestService to handle business logic for submitting, accepting, rejecting, and canceling booking requests.
- Create DTOs for creating booking requests and reviewing them.
- Define BookingRequest entity to map to the booking_requests table.
- Add UI components for managing shipment requests, including detail and list pages.
- Implement OperationDatePicker component for selecting available shipment days.

apps/edr-freight-web/backoffice/src/services/trainScheduling.service.ts

@@ -1,3 +1,4 @@
+import type { Freight } from "@edr/types";
 import { api as client } from "../auth/http";
 import { unwrap } from "@/utils/endpoint";
 import { URL_CONSTANTS } from "@/constants/URLS";
@@ -127,6 +128,24 @@ export const trainSchedulingService = {
     return unwrap(response.data).days;
   },
 
+  // Cargo-aware day pool (matching wagons + open train capacity). `containers`
+  // is serialized as a JSON string param (the server parses it).
+  getAvailableDaysForCargo: async (
+    query: Freight.AvailableDaysForCargoQuery,
+  ): Promise<string[]> => {
+    const { containers, ...rest } = query;
+    const response = await client.get<{ days: string[] }>(
+      URL_CONSTANTS.TRAIN_SCHEDULING.AVAILABLE_DAYS_FOR_CARGO,
+      {
+        params: {
+          ...rest,
+          ...(containers ? { containers: JSON.stringify(containers) } : {}),
+        },
+      },
+    );
+    return unwrap(response.data).days;
+  },
+
   runBatch: async (scheduleId: string): Promise<BatchBoardScheduleDetail> => {
     const response = await client.post<BatchBoardScheduleDetail>(
       URL_CONSTANTS.TRAIN_SCHEDULING.RUN_BATCH(scheduleId),