refactor frontend terminology to course system mapping

Align frontend wording with final domain terms (course system/course/lesson block), keep PickTargets backward compatible with backend values, and fix related import paths.

Made-with: Cursor

src/store/daka.ts

@@ -24,7 +24,7 @@ import useLianxi from "~/store/lianxi";
 import useComment from "~/store/comment";
 import usePiyue from "~/store/piyue";
 import useNotify from "~/store/notify";
-import useCourseCategory from "~/store/course-category";
+import useCourseCategory from "~/store/qumu-category";
 
 const initialDaka = () => ({
     start_date: dayjs().startOf('day').toDate(),
@@ -197,7 +197,7 @@ export default function useDaka() {
             return false;
         }
         if (!course_sections?.length) {
-            showFailToast('请添加科目！')
+            showFailToast('请添加课程！')
             return false;
         }
         return true
@@ -217,7 +217,7 @@ export default function useDaka() {
             let { resources, ref_resources, id, resource_note_group, ...rest } = course_sections[i];
             ref_resources = ref_resources || resources;
             if (!ref_resources?.some(r => r.ref_type === RefTypes.CourseSection && r.resource_type === RefResourceTypes.Picture)) {
-                showFailToast("科目【" + rest.course_name + "(" + rest.section_name + ")" + "】没有曲谱！")
+                showFailToast("课程【" + rest.course_name + "(" + rest.section_name + ")" + "】没有曲谱！")
                 return false;
             }
             if (!resource_note_group) {