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/CompanyOldNameService.java

@@ -1,7 +1,26 @@
 package com.ecep.contract.service;
 
+import java.time.LocalDate;
+import java.util.List;
+
+import com.ecep.contract.model.Company;
 import com.ecep.contract.model.CompanyOldName;
 import com.ecep.contract.vm.CompanyOldNameViewModel;
 
 public class CompanyOldNameService implements ViewModelService<CompanyOldName, CompanyOldNameViewModel> {
+
+    public boolean makePathAbsent(CompanyOldName companyOldName) {
+        // TODO Auto-generated method stub
+        throw new UnsupportedOperationException("Unimplemented method 'makePathAbsent'");
+    }
+
+    public CompanyOldName findMatchByDate(Company company, LocalDate localDate) {
+        // TODO Auto-generated method stub
+        throw new UnsupportedOperationException("Unimplemented method 'findMatchByDate'");
+    }
+
+    public List<CompanyOldName> findAllByCompanyAndName(Company company, String oldName) {
+        // TODO Auto-generated method stub
+        throw new UnsupportedOperationException("Unimplemented method 'findAllByCompanyAndName'");
+    }
 }