修复员工机床绑定保存失败：DTO增加MachineIds字段，Service Create/Update增加绑定逻辑

src/CncModels/Dto/Worker/CreateWorkerRequest.cs

@@ -1,3 +1,5 @@
+using System.Collections.Generic;
+
 namespace CncModels.Dto.Worker
 {
     /// <summary>
@@ -7,5 +9,7 @@ namespace CncModels.Dto.Worker
     {
         public string Name { get; set; }
         public string Code { get; set; }
+        /// <summary>绑定的机床ID列表</summary>
+        public List<int> MachineIds { get; set; }
     }
 }

src/CncModels/Dto/Worker/UpdateWorkerRequest.cs

@@ -1,3 +1,5 @@
+using System.Collections.Generic;
+
 namespace CncModels.Dto.Worker
 {
     /// <summary>
@@ -6,5 +8,8 @@ namespace CncModels.Dto.Worker
     public class UpdateWorkerRequest
     {
         public string Name { get; set; }
+        public string Code { get; set; }
+        /// <summary>绑定的机床ID列表（全量替换）</summary>
+        public List<int> MachineIds { get; set; }
     }
 }

src/CncService/Impl/WorkerService.cs

@@ -79,7 +79,19 @@ namespace CncService.Impl
                 CreatedAt = DateTime.Now,
                 UpdatedAt = DateTime.Now
             };
-            return _workerRepository.Create(entity);
+            var workerId = _workerRepository.Create(entity);
+
+            // 绑定机床
+            if (request.MachineIds != null)
+            {
+                foreach (var mid in request.MachineIds)
+                {
+                    var binding = _workerMachineRepository.GetByMachineId(mid);
+                    if (binding != null) throw new BusinessException(ErrorCode.Conflict, $"机床(ID={mid})已绑定其他工人");
+                    _workerMachineRepository.Create(workerId, mid);
+                }
+            }
+            return workerId;
         }
 
         /// <inheritdoc/>
@@ -91,8 +103,27 @@ namespace CncService.Impl
             if (entity == null) throw new BusinessException(ErrorCode.NotFound, "员工未找到");
 
             entity.Name = request.Name ?? entity.Name;
+            if (!string.IsNullOrWhiteSpace(request.Code) && request.Code != entity.Code)
+            {
+                var dup = _workerRepository.GetByCode(request.Code);
+                if (dup != null) throw new BusinessException(ErrorCode.Conflict, "工号已存在");
+                entity.Code = request.Code;
+            }
             entity.UpdatedAt = DateTime.Now;
-            return _workerRepository.Update(entity);
+            _workerRepository.Update(entity);
+
+            // 全量替换机床绑定
+            if (request.MachineIds != null)
+            {
+                _workerMachineRepository.DeleteByWorkerId(id);
+                foreach (var mid in request.MachineIds)
+                {
+                    var binding = _workerMachineRepository.GetByMachineId(mid);
+                    if (binding != null) throw new BusinessException(ErrorCode.Conflict, $"机床(ID={mid})已绑定其他工人");
+                    _workerMachineRepository.Create(id, mid);
+                }
+            }
+            return true;
         }
 
         /// <inheritdoc/>