AI自主生成：生成课程小节绑定主题id（数字人id）

src/components/study/SelfDirectedLearning.vue

@@ -189,9 +189,6 @@ const lessonList = ref([
 const selectedMainTeacher = ref('')
 const selectedAssistants = ref([''])
 
-// 选中的主题value
-const selectedThemeValue = ref('')
-
 //脚本数据
 const scriptData = reactive(
     {
@@ -320,7 +317,7 @@ const generateScript = async () => {
     //2、生成课程小节
     progressSteps.value[1].visible = true;
     progressSteps.value[1].active = true;
-    await createAiRoleIdConversation(selectedThemeValue.value)
+    await createAiRoleIdConversation(courseDropdown.value.value)
     const role = localScriptRoles.value.find((r) => r.name === selectedMainTeacher.value)
     const assistants = selectedAssistants.value.map(rName => {
       const assistantRole = localScriptRoles.value.find(r => r.name === rName)