feat: 添加合约文件类型服务及错误处理改进

refactor: 重构合约文件类型相关代码，优化错误处理逻辑

fix: 修复WebSocket会话未绑定用户时的错误处理

style: 调整代码格式，提高可读性

docs: 更新部分代码注释

test: 添加合约文件类型服务的测试用例

chore: 移除无用代码，清理项目结构

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

@@ -47,6 +47,7 @@ import com.ecep.contract.service.CompanyService;
 import com.ecep.contract.service.CompanyVendorService;
 import com.ecep.contract.service.ContractBidVendorService;
 import com.ecep.contract.service.ContractFileService;
+import com.ecep.contract.service.ContractFileTypeService;
 import com.ecep.contract.service.ContractService;
 import com.ecep.contract.service.EmployeeService;
 import com.ecep.contract.service.ExtendVendorInfoService;
@@ -77,6 +78,7 @@ public class ContractVerifyComm {
     // Contract
     private ContractService contractService;
     private ContractFileService contractFileService;
+    private ContractFileTypeService contractFileTypeService;
     private ContractBidVendorService contractBidVendorService;
 
     // Company
@@ -150,6 +152,13 @@ public class ContractVerifyComm {
         return contractFileService;
     }
 
+    private ContractFileTypeService getContractFileTypeService() {
+        if (contractFileTypeService == null) {
+            contractFileTypeService = SpringApp.getBean(ContractFileTypeService.class);
+        }
+        return contractFileTypeService;
+    }
+
     private ContractBidVendorService getContractBidVendorService() {
         if (contractBidVendorService == null) {
             contractBidVendorService = SpringApp.getBean(ContractBidVendorService.class);
@@ -488,7 +497,7 @@ public class ContractVerifyComm {
     ContractFileTypeLocal getFileTypeLocal(ContractFileType type) {
         if (fileTypeLocalMap == null) {
             fileTypeLocalMap = FXCollections
-                    .observableMap(getContractFileService().findAllFileTypes(getLocale().toLanguageTag()));
+                    .observableMap(getContractFileTypeService().findAll(getLocale()));
         }
         return fileTypeLocalMap.get(type);
     }