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/CompanyCustomerEntityService.java

@@ -8,15 +8,15 @@ import org.springframework.data.domain.Pageable;
 
 import com.ecep.contract.model.CompanyCustomer;
 import com.ecep.contract.model.CompanyCustomerEntity;
-import com.ecep.contract.vm.CompanyCustomerViewModel;
+import com.ecep.contract.vm.CustomerEntityViewModel;
 
-public class CompanyCustomerEntityService implements ViewModelService<CompanyCustomer, CompanyCustomerViewModel> {
+public class CompanyCustomerEntityService implements ViewModelService<CompanyCustomerEntity, CustomerEntityViewModel> {
     public List<CompanyCustomerEntity> findAllByCustomer(CompanyCustomer customer) {
         throw new UnsupportedOperationException();
     }
 
     @Override
-    public Page<CompanyCustomer> findAll(Map<String, Object> params, Pageable pageable) {
+    public Page<CompanyCustomerEntity> findAll(Map<String, Object> params, Pageable pageable) {
         // TODO Auto-generated method stub
         throw new UnsupportedOperationException("Unimplemented method 'findAll'");
     }