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/service/CompanyCustomerFileService.java

@@ -27,6 +27,11 @@ import com.ecep.contract.vo.ContractVo;
 @Service
 @CacheConfig(cacheNames = "customer-file")
 public class CompanyCustomerFileService extends QueryService<CompanyCustomerFileVo, CompanyCustomerFileViewModel> {
+    
+    public File getEvaluationFormTemplate() {
+        throw new UnsupportedOperationException();
+    }
+
     @Cacheable
     @Override
     public CompanyCustomerFileVo findById(Integer id) {
@@ -95,9 +100,6 @@ public class CompanyCustomerFileService extends QueryService<CompanyCustomerFile
         return SpringApp.getBean(HolidayService.class).adjustToWorkDay(setupDate.plusDays(-7));
     }
 
-    public File getEvaluationFormTemplate() {
-        throw new UnsupportedOperationException();
-    }
 
     public List<CompanyCustomerFileVo> findAllByCustomer(CompanyCustomerVo companyCustomer) {
         return findAll(ParamUtils.builder().equals("customer", companyCustomer).build(), Pageable.unpaged())