Refactor wagon type handling and container wagon calculations

- Removed maxWagonsPerTrain from WagonType entity and related DTOs.
- Updated containerWagonsForLines function to calculate required wagons based on container lines more accurately.
- Added unit tests for containerWagonsForLines to ensure correct calculations.
- Adjusted related services and scripts to reflect the removal of maxWagonsPerTrain.
- Enhanced booking and contract components to use new status labels for better user experience.
- Implemented validation for unique container numbers in shipment forms.

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

@@ -1,6 +1,7 @@
 import {
   bookingTrainLengthMeters,
   deriveTrainCapacityFromLocomotive,
+  minLocomotiveLimits,
 } from './train-capacity.util';
 
 describe('train-capacity.util', () => {
@@ -38,4 +39,31 @@ describe('train-capacity.util', () => {
     ).toBe(28);
     expect(bookingTrainLengthMeters('BULK', 3, { container: 14, bulk: 18 })).toBe(54);
   });
+
+  it('extends weight/length caps by the locomotive overage tolerance (fertilizer +90T example)', () => {
+    const pw2 = { lengthMeters: 17.066, capacityTons: 70 };
+    const derived = deriveTrainCapacityFromLocomotive(
+      { maxPullWeightTons: 3500, maxTrainLengthMeters: 760, overageToleranceTons: 90 },
+      [pw2],
+    );
+    expect(derived.maxWeightTons).toBe(3590);
+  });
+
+  it('ignores overage tolerance when unset (strict cap, no behavior change)', () => {
+    const derived = deriveTrainCapacityFromLocomotive(
+      { maxPullWeightTons: 3500, maxTrainLengthMeters: 760 },
+      [{ lengthMeters: 14, capacityTons: 70 }],
+    );
+    expect(derived.maxWeightTons).toBe(3500);
+    expect(derived.maxLengthMeters).toBe(760);
+  });
+
+  it('takes the weakest locomotive tolerance across a multi-locomotive set', () => {
+    const limits = minLocomotiveLimits([
+      { maxPullWeightTons: 3500, maxTrainLengthMeters: 760, overageToleranceTons: 90 },
+      { maxPullWeightTons: 4000, maxTrainLengthMeters: 760, overageToleranceTons: 20 },
+    ]);
+    expect(limits?.maxPullWeightTons).toBe(3500);
+    expect(limits?.overageToleranceTons).toBe(20);
+  });
 });