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/task/ContractFilesRebuildAllTasker.java

@@ -0,0 +1,21 @@
+package com.ecep.contract.task;
+
+import com.ecep.contract.MessageHolder;
+import com.ecep.contract.model.ContractGroup;
+import com.ecep.contract.service.ContractService;
+
+import lombok.Setter;
+
+public class ContractFilesRebuildAllTasker extends Tasker<Object>{
+    @Setter
+    private ContractService contractService;
+
+    @Setter
+    private ContractGroup group;
+
+    @Override
+    protected Object execute(MessageHolder holder) throws Exception {
+        // TODO Auto-generated method stub
+        throw new UnsupportedOperationException("Unimplemented method 'execute'");
+    }
+}