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

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+package com.ecep.contract.service;
+
+public class CompanyFileTypeService {
+}

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

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+package com.ecep.contract.service;
+
+public class CustomerCatalogService {
+}

client/src/main/java/com/ecep/contract/vm/CustomerCatalogViewModel.java

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+package com.ecep.contract.vm;
+
+public class CustomerCatalogViewModel {
+}

client/src/main/java/com/ecep/contract/vm/SysConfViewModel.java

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+package com.ecep.contract.vm;
+
+public class SysConfViewModel {
+}

common/src/main/java/com/ecep/contract/constant/CompanyConstant.java

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+package com.ecep.contract.constant;
+
+public class CompanyConstant {
+}

server/src/main/java/com/ecep/contract/ds/company/service/CompanyFileTypeService.java

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+package com.ecep.contract.ds.company.service;
+
+public class CompanyFileTypeService {
+}