fix(学生组件): 将硬编码语言标识替换为动态变量

修改chat_stream调用中的语言参数，从硬编码的'zh-CN'改为使用lang.lang变量，以支持多语言场景

src/views/Student/components/choiceQuestionDetailDialog.vue

@@ -830,7 +830,7 @@ const aiAnalysisRefresh45 = () => {
     }).json = ''
   }
 
-  chat_stream(msg, 'a7741704-ba56-40b7-a6b8-62a423ef9376', props.userId, 'zh-CN', (event) => {
+  chat_stream(msg, 'a7741704-ba56-40b7-a6b8-62a423ef9376', props.userId, lang.lang, (event) => {
     if (event.type === 'message') { 
       aiAnalysisData.value.find((item:any) => {
         return item.pid === props.showData.workDetail.id && item.index === props.showData.workIndex
@@ -907,7 +907,7 @@ const aiAnalysisRefresh15 = () => {
     }).json = ''
   }
 
-  chat_stream(msg, 'a7741704-ba56-40b7-a6b8-62a423ef9376', props.userId, 'zh-CN', (event) => {
+  chat_stream(msg, 'a7741704-ba56-40b7-a6b8-62a423ef9376', props.userId, lang.lang, (event) => {
     if (event.type === 'message') { 
       aiAnalysisData.value.find((item:any) => {
         return item.pid === props.showData.workDetail.id && item.index === props.showData.workIndex