fix: limit dispatch vehicles to 15 and 30 pallets

lastleg-service/src/test/java/com/baiyue/lastleg/delivery/PlatformDispatchOutboundContractTest.java

@@ -181,6 +181,7 @@ class PlatformDispatchOutboundContractTest {
         assertTrue(yaml.contains("platform:overseas-warehouse:outbound:list"));
         assertTrue(yaml.contains("platform:overseas-warehouse:outbound:create"));
         assertTrue(yaml.contains("platform:overseas-warehouse:outbound:cancel"));
+        assertTrue(yaml.contains("vehicleSize: { type: string, nullable: true, enum: [15托, 30托] }"));
     }
 
     private static void assertPermission(Method method, String permission) {

lastleg-service/src/test/java/com/baiyue/lastleg/dispatch/SmartDispatchOpenApiContractTest.java

@@ -25,6 +25,7 @@ class SmartDispatchOpenApiContractTest {
         assertTrue(yaml.contains("/api/platform/v1/last-leg/dispatches/drafts/{draftToken}/containers/{containerId}:"));
         assertTrue(yaml.contains("draftContainerId:"));
         assertTrue(yaml.contains("SmartDispatchDraftContainer:"));
+        assertTrue(yaml.contains("capacity: { type: integer, enum: [15, 30] }"));
         assertTrue(yaml.contains("SmartDispatchDraft:"));
         assertTrue(yaml.contains("platform:overseas-warehouse:inbound-order:list"));
         assertTrue(yaml.contains("platform:overseas-warehouse:inbound-order:smart-dispatch"));

lastleg-service/src/test/java/com/baiyue/lastleg/dispatch/service/DispatchServiceTest.java

@@ -252,6 +252,17 @@ class DispatchServiceTest {
         verify(locks).findActiveByDraftContainer("draft-1", 21L);
     }
 
+    @Test
+    void draftContainerOnlyAcceptsFifteenOrThirtyPalletVehicles() {
+        ResponseStatusException exception = assertThrows(ResponseStatusException.class,
+            () -> service.createDraftContainer("7", new DispatchRequests.DraftContainer("draft-1", 14)));
+
+        assertEquals(409, exception.getStatusCode().value());
+        assertEquals("车辆大小仅支持15托或30托", exception.getReason());
+        verify(drafts, never()).lockActive(any(), any());
+        verify(draftContainers, never()).insert(any(DispatchDraftContainer.class));
+    }
+
     @Test
     void rejectsPalletAlreadyLockedByAnotherDispatch() {
         when(candidates.lockSelected("100", List.of(10L))).thenReturn(List.of(candidate(10L, null, "ONT8")));