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/service/ProjectQuotationService.java

@@ -1,5 +1,16 @@
 package com.ecep.contract.service;
 
+import java.util.List;
+
+import com.ecep.contract.model.Project;
+import com.ecep.contract.model.ProjectQuotation;
+import com.ecep.contract.vm.ProjectQuotationViewModel;
+
 public class ProjectQuotationService  implements ViewModelService<ProjectQuotation, ProjectQuotationViewModel>{
 
+    public List<ProjectQuotation> findAllByProject(Project project) {
+        // TODO Auto-generated method stub
+        throw new UnsupportedOperationException("Unimplemented method 'findAllByProject'");
+    }
+
 }