refactor(vo): 重构VO类及相关模型，添加Voable接口实现

feat(constant): 添加WebSocket错误码常量
docs(model): 为模型类添加注释
fix(service): 修复ProductUsageService缓存键问题
refactor(converter): 重构字符串转换器，移除EntityStringConverter依赖
feat(tab): 添加ComboBoxUtils工具类，优化下拉框初始化
style: 移除无用导入和字段

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

@@ -1,5 +1,10 @@
 package com.ecep.contract.service;
 
+import com.ecep.contract.converter.BankStringConverter;
+import com.ecep.contract.util.ParamUtils;
+import com.ecep.contract.vm.BankViewModel;
+import com.ecep.contract.vo.BankVo;
+import javafx.util.StringConverter;
 import org.springframework.cache.annotation.CacheConfig;
 import org.springframework.cache.annotation.CacheEvict;
 import org.springframework.cache.annotation.Cacheable;
@@ -8,15 +13,12 @@ import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 import org.springframework.stereotype.Service;
 
-import com.ecep.contract.util.ParamUtils;
-import com.ecep.contract.vm.BankViewModel;
-import com.ecep.contract.vo.BankVo;
-
-import javafx.util.StringConverter;
-
 @Service
 @CacheConfig(cacheNames = "bank")
 public class BankService extends QueryService<BankVo, BankViewModel> {
+
+    private final BankStringConverter stringConverter = new BankStringConverter(this);
+
     @Cacheable(key = "#p0")
     @Override
     public BankVo findById(Integer id) {
@@ -31,32 +33,20 @@ public class BankService extends QueryService<BankVo, BankViewModel> {
         return page.getContent().getFirst();
     }
 
-    @Caching(evict = { @CacheEvict(key = "#p0.id") })
+    @Caching(evict = {@CacheEvict(key = "#p0.id")})
     @Override
     public BankVo save(BankVo entity) {
         return super.save(entity);
     }
 
-    @Caching(evict = { @CacheEvict(key = "#p0.id") })
+    @Caching(evict = {@CacheEvict(key = "#p0.id")})
     @Override
     public void delete(BankVo entity) {
         super.delete(entity);
     }
 
-    private StringConverter<BankVo> stringConverter = new StringConverter<BankVo>() {
-        @Override
-        public String toString(BankVo object) {
-            return object == null ? "" : object.getName();
-        }
-
-        @Override
-        public BankVo fromString(String string) {
-            return findByName(string);
-        }
-    };
-
     @Override
-    public StringConverter<BankVo> getStringConverter() {
+    public BankStringConverter getStringConverter() {
         return stringConverter;
     }