feat(service): 实现国际化支持并优化Service层

重构文件类型相关Service以支持国际化查询
添加findOneByLang辅助方法统一查询逻辑
实现StringConverter支持UI控件显示
优化缓存配置和查询性能
新增UnitStringConverter和CustomerCatalogStringConverter
完善文档和测试用例

client/src/main/java/com/ecep/contract/task/CompanyCustomerRebuildFilesTasker.java

@@ -0,0 +1,37 @@
+package com.ecep.contract.task;
+
+import com.ecep.contract.MessageHolder;
+import com.ecep.contract.WebSocketClientTasker;
+import com.ecep.contract.vo.CompanyCustomerVo;
+
+import lombok.Getter;
+import lombok.Setter;
+
+/**
+ * 客户文件重建任务类
+ * 用于通过WebSocket与服务器通信，重建客户相关文件
+ */
+public class CompanyCustomerRebuildFilesTasker extends Tasker<Object> implements WebSocketClientTasker {
+    @Getter
+    @Setter
+    private CompanyCustomerVo companyCustomer;
+    
+    @Getter
+    protected boolean filesUpdated = false;
+    
+    @Override
+    public String getTaskName() {
+        return "CompanyCustomerRebuildFilesTasker";
+    }
+    
+    @Override
+    public void updateProgress(long current, long total) {
+        super.updateProgress(current, total);
+    }
+    
+    @Override
+    protected Object execute(MessageHolder holder) throws Exception {
+        updateTitle("重建客户文件");
+        return callRemoteTask(holder, getLocale(), companyCustomer.getId());
+    }
+}

client/src/main/java/com/ecep/contract/task/ContractSyncTask.java

@@ -1,13 +1,12 @@
 package com.ecep.contract.task;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import com.ecep.contract.MessageHolder;
 import com.ecep.contract.SpringApp;
 import com.ecep.contract.WebSocketClientTasker;
-import com.ecep.contract.WebSocketClientService;
 import com.ecep.contract.service.YongYouU8Service;
-import com.fasterxml.jackson.core.JsonProcessingException;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 /**
  * 合同同步任务