完善 WMS 搬运任务与库位状态相关接口。

补齐运输规划与任务服务在状态/优先级字段上的读写与调度衔接。

Co-authored-by: Cursor <cursoragent@cursor.com>

MiGu.Server/Wms/WmsService.cs

@@ -499,7 +499,14 @@ public sealed class WmsService
         });
 
         await AddContainerMoveEventAsync(req.ContainerId, fromStorageId, toStorageId, actor, req.Reason.TrimOr(""), now);
-        await _db.SaveChangesAsync();
+        try
+        {
+            await _db.SaveChangesAsync();
+        }
+        catch (DbUpdateException ex) when (IsUniqueConstraintViolation(ex))
+        {
+            throw new InvalidOperationException("目标库位已被其他容器占用，库位与容器为 1 对 1");
+        }
         await SyncOccupancyStatus(containerId: req.ContainerId, storageId: fromStorageId);
         await SyncOccupancyStatus(storageId: toStorageId);
         return current;
@@ -857,6 +864,20 @@ public sealed class WmsService
             throw new InvalidOperationException("数据已被其他用户修改，请刷新后重试");
     }
 
+    private static bool IsUniqueConstraintViolation(DbUpdateException ex)
+    {
+        for (Exception? e = ex; e != null; e = e.InnerException)
+        {
+            var msg = e.Message;
+            if (msg.Contains("UNIQUE constraint failed", StringComparison.OrdinalIgnoreCase)
+                || msg.Contains("unique index", StringComparison.OrdinalIgnoreCase)
+                || msg.Contains("duplicate key", StringComparison.OrdinalIgnoreCase))
+                return true;
+        }
+
+        return false;
+    }
+
     private static void EnsureUnlocked(EntityBase entity)
     {
         if (entity.IsLock) throw new InvalidOperationException("数据已锁定，不能修改");