feat(converter): 实现通用枚举转换器和供应商类型转换器

添加EnumEntityStringConverter作为通用枚举转换基类
实现VendorTypeStringConverter用于供应商类型本地化转换
在VendorTypeService中添加findByLocaleAndValue方法支持转换器
优化ComboBoxUtils的绑定逻辑使其支持可选属性
新增VendorCatalogService提供供应商目录CRUD功能

client/src/main/java/com/ecep/contract/converter/EnumEntityStringConverter.java

@@ -1,4 +1,18 @@
 package com.ecep.contract.converter;
 
-public class EnumEntityStringConverter {
+import com.ecep.contract.model.BaseEnumEntity;
+import javafx.util.StringConverter;
+
+public class EnumEntityStringConverter<E extends Enum<?>, T extends BaseEnumEntity<E>> extends StringConverter<T> {
+
+    @Override
+    public String toString(T object) {
+        return object == null ? "" : object.getValue();
+    }
+
+    @Override
+    public T fromString(String string) {
+        return null;
+        // return service.findByName(string);
+    }
 }

client/src/main/java/com/ecep/contract/converter/VendorTypeStringConverter.java

@@ -1,4 +1,24 @@
 package com.ecep.contract.converter;
 
-public class VendorTypeStringConverter {
+import com.ecep.contract.Desktop;
+import com.ecep.contract.service.VendorTypeService;
+import com.ecep.contract.vo.VendorTypeLocalVo;
+import javafx.util.StringConverter;
+
+public class VendorTypeStringConverter extends StringConverter<VendorTypeLocalVo> {
+    private final VendorTypeService service;
+
+    public VendorTypeStringConverter(VendorTypeService service) {
+        this.service = service;
+    }
+
+    @Override
+    public String toString(VendorTypeLocalVo object) {
+        return object.getValue();
+    }
+
+    @Override
+    public VendorTypeLocalVo fromString(String string) {
+        return service.findByLocaleAndValue(Desktop.instance.getActiveEmployee().localeProperty().get(), string);
+    }
 }