feat: 添加新模块的基础类和主应用类

添加了多个基础服务类和视图模型类，包括SysConfViewModel、CompanyConstant等
实现了客户端和服务端的主应用类，包含启动配置和默认连接参数

client/src/main/java/com/ecep/contract/service/CompanyFileTypeService.java

@@ -0,0 +1,4 @@
+package com.ecep.contract.service;
+
+public class CompanyFileTypeService {
+}

client/src/main/java/com/ecep/contract/service/CustomerCatalogService.java

@@ -0,0 +1,4 @@
+package com.ecep.contract.service;
+
+public class CustomerCatalogService {
+}