refactor(client): 重构服务类继承关系并统一使用QueryService

重构所有服务类，使其继承自QueryService接口，统一数据查询逻辑。同时为服务类添加@Service注解，确保Spring容器管理。更新相关FXML文件的控制器路径，从manager.ds调整为controller目录结构。调整pom.xml版本号至0.0.84-SNAPSHOT。新增MessageNotitfication和SimpleMessage消息类，提供基础消息结构支持。

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

@@ -4,6 +4,8 @@ import java.io.File;
 import java.time.LocalDate;
 import java.util.List;
 
+import org.springframework.stereotype.Service;
+
 import com.ecep.contract.MessageHolder;
 import com.ecep.contract.model.CompanyVendor;
 import com.ecep.contract.model.Contract;
@@ -12,7 +14,8 @@ import com.ecep.contract.model.ContractGroup;
 import com.ecep.contract.model.Project;
 import com.ecep.contract.vm.ContractViewModel;
 
-public class ContractService implements ViewModelService<Contract, ContractViewModel> {
+@Service
+public class ContractService extends QueryService<Contract, ContractViewModel> {
 
     public boolean updateParentCode(Contract contract) {
         // TODO Auto-generated method stub
@@ -28,10 +31,6 @@ public class ContractService implements ViewModelService<Contract, ContractViewM
         throw new UnsupportedOperationException("Unimplemented method 'findByCode'");
     }
 
-    public List<Contract> search(String searchText) {
-        throw new UnsupportedOperationException("Unimplemented method 'search'");
-    }
-
     public Contract findByName(String name) {
         throw new UnsupportedOperationException("Unimplemented method 'findByName'");
     }