Enhance wagon capacity handling and validation in booking service

- Added default capacities for container and bulk wagons.
- Updated wagonsFor method to consider weight and length for wagon calculations.
- Improved handling of overweight bookings with appropriate warnings.
- Adjusted tests to reflect changes in wagon capacity and validation logic.

apps/edr-freight-api/src/modules/train-scheduling/train-scheduling.service.spec.ts

@@ -72,7 +72,7 @@ const makeBooking = (
       wagonsRequired,
       vgmPerUnitTons: weight / quantity,
       isOverweight: false,
-      containerType: { code: containerCode, label: containerCode },
+      containerType: { code: containerCode, label: containerCode, wagonTypeId: nw5.id },
     },
   ],
   ...extra,
@@ -282,7 +282,7 @@ describe('TrainSchedulingService', () => {
     expect(result.warnings[0]).toContain('soft hold window');
   });
 
-  it('flags the overweight booking as invalid', async () => {
+  it('warns on the overweight booking but still allows scheduling', async () => {
     const bookings = [
       makeBooking('b6', 'BKG-CONT-006', 3600, 80, '40FT', 80, undefined, undefined, undefined, {
         bookingContainers: [
@@ -293,7 +293,7 @@ describe('TrainSchedulingService', () => {
             wagonsRequired: 80,
             vgmPerUnitTons: 45,
             isOverweight: true,
-            containerType: { code: '40FT', label: '40FT' },
+            containerType: { code: '40FT', label: '40FT', wagonTypeId: nw5.id },
           },
         ],
       }),
@@ -311,8 +311,8 @@ describe('TrainSchedulingService', () => {
       destinationStationId: 'yard-destination',
     });
 
-    expect(result.valid).toBe(false);
-    expect(result.violations.some((v) => v.includes('overweight'))).toBe(true);
+    expect(result.violations.some((v) => v.includes('overweight'))).toBe(false);
+    expect(result.warnings.some((w) => w.includes('overweight'))).toBe(true);
   });
 
   it('allows preview when bookings are already on the target schedule', async () => {