feat: 新增多个服务类及工具类，重构部分代码结构

重构服务类结构，将分散的服务统一整合到service包下
新增ProjectConstant常量类及多个实体服务类
添加SecurityUtils安全工具类和BeanCacher工具类
优化部分UI控件和转换器的实现

client/src/main/java/com/ecep/contract/vm/PurchaseOrderViewModel.java

@@ -16,8 +16,6 @@ import lombok.EqualsAndHashCode;
 @Data
 @EqualsAndHashCode(callSuper = false)
 public class PurchaseOrderViewModel extends IdentityViewModel<PurchaseOrder> {
-
-    SimpleIntegerProperty id = new SimpleIntegerProperty();
     SimpleIntegerProperty refId = new SimpleIntegerProperty();
     SimpleObjectProperty<Contract> contract = new SimpleObjectProperty<>();
     SimpleObjectProperty<Employee> employee = new SimpleObjectProperty<>();
@@ -33,7 +31,7 @@ public class PurchaseOrderViewModel extends IdentityViewModel<PurchaseOrder> {
 
     @Override
     protected void updateFrom(PurchaseOrder v) {
-        getId().set(v.getId());
+        super.updateFrom(v);
         getRefId().set(v.getRefId());
         getContract().set(v.getContract());
         getEmployee().set(v.getEmployee());
@@ -52,10 +50,6 @@ public class PurchaseOrderViewModel extends IdentityViewModel<PurchaseOrder> {
     @Override
     public boolean copyTo(PurchaseOrder v) {
         boolean modified = super.copyTo(v);
-        if (!Objects.equals(id.get(), v.getId())) {
-            v.setId(id.get());
-            modified = true;
-        }
         if (!Objects.equals(refId.get(), v.getRefId())) {
             v.setRefId(refId.get());
             modified = true;