fix: enforce dropship pallet count for inbound plans

lastleg-service/src/test/java/com/baiyue/lastleg/inboundplan/service/ContainerInboundPlanPreviewTest.java

@@ -120,6 +120,25 @@ class ContainerInboundPlanPreviewTest {
         assertEquals("RESOURCE_PENDING", result.groups().get(0).orders().get(0).readiness());
     }
 
+    @Test
+    void blocksExistingDropshipPlanWhosePalletCountDiffersFromFrozenSourcePallets() {
+        when(orderMapper.containerPreviewOrders("BOOKING-DROPSHIP-MISMATCH")).thenReturn(List.of(
+            row(1L, "LM-DROPSHIP", "ONE_CLICK_DROPSHIP", "OVERSEAS", "US-LAX-01", "洛杉矶仓", 2,
+                "IP-DROPSHIP", 2, 1, "PENDING_ASSIGNMENT", 0)
+        ));
+        when(dropshipOrders.palletSnapshots("100", 1L)).thenReturn(List.of(
+            new DropshipPalletSnapshot("DP-260914-0001", 10, List.of())));
+
+        var result = service.previewContainer("BOOKING-DROPSHIP-MISMATCH");
+        var order = result.groups().get(0).orders().get(0);
+
+        assertFalse(result.ready());
+        assertEquals("BLOCKED", order.readiness());
+        assertEquals(List.of("DROPSHIP_PALLET_COUNT_MISMATCH"), order.blockers());
+        assertEquals(1, order.sourcePalletCount());
+        assertEquals(2, order.targetPalletCount());
+    }
+
     @Test
     void exposesHeadLegExistingSupplementAndFinalPalletCountsWithoutBlocking() {
         when(orderMapper.containerPreviewOrders("BOOKING-SUPPLEMENT")).thenReturn(List.of(

lastleg-service/src/test/java/com/baiyue/lastleg/inboundplan/service/InboundPlanServiceTest.java

@@ -183,6 +183,43 @@ class InboundPlanServiceTest {
         verify(commandMapper, never()).insert(any(com.baiyue.lastleg.entity.LastlegOrderCommandRecord.class));
     }
 
+    @Test
+    void oneClickDropshipManualPlanMustKeepTheFrozenSourcePalletCount() {
+        SourceOrderSnapshot source = order(2L, "RK-2", "3.3650", "WH-A");
+        when(orderMapper.lockOrder("100", 2L)).thenReturn(List.of(source));
+        when(orderMapper.findOrderType("100", 2L)).thenReturn("ONE_CLICK_DROPSHIP");
+        when(dropshipOrders.palletSnapshots("100", 2L)).thenReturn(List.of(
+            new DropshipPalletSnapshot("DP-260914-0001", 10L, List.of())));
+
+        ResponseStatusException error = assertThrows(ResponseStatusException.class, () -> service.convertManual(
+            new ManualInboundPlanRequest("100", 2L, 0, LocalDate.of(2026, 9, 15),
+                2, "WOOD", false, false, false, null), "dropship-pallet-mismatch", "900"));
+
+        assertEquals(400, error.getStatusCode().value());
+        assertEquals("一件代发人工计划托数必须与头程封托托盘数一致：1", error.getReason());
+        verify(planMapper, never()).insert(any(InboundPlan.class));
+        verify(commandMapper, never()).insert(any(com.baiyue.lastleg.entity.LastlegOrderCommandRecord.class));
+    }
+
+    @Test
+    void oneClickDropshipUsesFrozenSourcePalletCountInsteadOfVolumeSuggestion() {
+        SourceOrderSnapshot source = order(2L, "RK-2", "3.3650", "WH-A");
+        when(orderMapper.lockOrder("100", 2L)).thenReturn(List.of(source));
+        when(orderMapper.findOrderType("100", 2L)).thenReturn("ONE_CLICK_DROPSHIP");
+        when(dropshipOrders.palletSnapshots("100", 2L)).thenReturn(List.of(
+            new DropshipPalletSnapshot("DP-260914-0001", 10L, List.of())));
+        when(orderMapper.markPlannedManual(eq("100"), eq(2L), any(), eq(1), eq(false), eq(0), any()))
+            .thenReturn(1);
+
+        var result = service.convertManual(new ManualInboundPlanRequest("100", 2L, 0,
+            LocalDate.of(2026, 9, 15), 1, "WOOD", false, false, false, null),
+            "dropship-exact-pallet-count", "900");
+
+        assertEquals(1, result.palletCount());
+        verify(planMapper).insert(any(InboundPlan.class));
+        verify(palletMapper).insert(any(InboundPlanPallet.class));
+    }
+
     @Test
     void containerConversionBindsRealWarehousePalletsBackToSignedManualPlanBeforeReceiving() {
         InboundPlan plan = existingPlan("100", 2L, "IP-MANUAL");