fix(dictionary): 修复语义映射和错误日志

- 修复语义映射：强制将输入转换为查询语言的对应词
- 移除拼写自动纠正，避免错误纠正（如 franch→franchise）
- 修复 winston 日志 Error 对象序列化问题

src/modules/dictionary/dictionary-service.ts

@@ -42,7 +42,7 @@ export const serviceLookUp = async (dto: ServiceInputLookUp) => {
             },
             response.entries
         ).catch(error => {
-            log.error("Failed to save dictionary data", { error });
+            log.error("Failed to save dictionary data", { error: error instanceof Error ? error.message : String(error) });
         });
 
         return response;
@@ -54,7 +54,7 @@ export const serviceLookUp = async (dto: ServiceInputLookUp) => {
             definitionLang: definitionLang,
             dictionaryItemId: lastLookUpResult.id
         }).catch(error => {
-            log.error("Failed to save dictionary data", { error });
+            log.error("Failed to save dictionary data", { error: error instanceof Error ? error.message : String(error) });
         });
         return {
             standardForm: lastLookUpResult.standardForm,