feat(i18n): add new i18n message files and update request config

- Add new i18n message files: audit, course-plans, files, leave, nav, practice, scheduling, student, users

- Update existing i18n messages: ai, attendance, common, diagnostic, elective, error-book, exam-homework, grades, lesson-preparation, school, settings

- Update i18n request config for new locale handling

src/shared/i18n/messages/zh-CN/course-plans.json

@@ -0,0 +1,16 @@
+{
+  "title": "课程计划",
+  "description": "管理课程教学计划与周课时安排。",
+  "detail": {
+    "title": "课程计划详情",
+    "description": "查看课程计划详情。"
+  },
+  "edit": {
+    "title": "编辑课程计划",
+    "description": "更新课程计划详情。"
+  },
+  "create": {
+    "title": "新建课程计划",
+    "description": "创建新的课程教学计划。"
+  }
+}