feat: Refactor general contract handling and introduce drawdown orders

- Updated ContractRouteLineView to clarify that routes carry no quantity and are pure origin-destination lanes.
- Modified GeneralContractService to reflect changes in route handling, removing quantity-related logic.
- Adjusted BookingsService to persist contracted routes without quantities, aligning with the new contract structure.
- Revised CreateBookingDto and CreateContractRouteDto to remove quantity fields, emphasizing shared pool usage.
- Added ContractOrdersPanel component to display drawdown orders and their associated pool.
- Implemented useContractOrders and useContractPool hooks for fetching order and pool data.
- Created booking-orders.service.ts to manage API interactions for drawdown orders and pool data.
- Updated BookingRequestDetailPage and PlaceOrderDialog to accommodate new order handling logic.

packages/types/src/freight/index.ts

@@ -631,11 +631,15 @@ export interface CreateBookingContainerDto {
 }
 
 /** A contracted route+quantity line for a GENERAL contract. */
+/**
+ * A contracted route (lane) of a general contract — a pure origin→destination
+ * pair. Routes carry NO quantity; the contract draws from a single shared pool.
+ */
 export interface CreateContractRouteDto {
   originYardId: string;
   destinationYardId: string;
-  containerTypeId?: string | undefined;
-  quantity: number;
+  /** Road distance (km) for this route; used to bill road orders. */
+  km?: number | undefined;
 }
 
 export interface CreateBookingDto {
@@ -728,17 +732,18 @@ export interface CreateBookingOrderLineDto {
 }
 
 /** Per-route contracted / ordered / remaining pool line (multi-route contracts). */
+/**
+ * A contracted route (lane) of a general contract — a pure origin→destination
+ * pair the contract covers. Routes carry NO quantity; the contract draws from a
+ * single shared pool ({@link ContractQuantityLine}). An order picks one lane (for
+ * scheduling + road billing) and draws from that shared pool.
+ */
 export interface ContractRouteLine {
   routeLineId: string;
   originYardId: string;
   originYardName?: string | null;
   destinationYardId: string;
   destinationYardName?: string | null;
-  containerTypeId?: string | null;
-  containerTypeName?: string | null;
-  contractedQuantity: number;
-  orderedQuantity: number;
-  remainingQuantity: number;
   /** Road distance (km) for this route; used to bill road orders. Null for rail-only. */
   km?: number | null;
 }