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/audit.json

@@ -0,0 +1,12 @@
+{
+  "title": "审计日志",
+  "description": "追踪系统内所有用户操作，保障安全与合规。",
+  "loginLogs": {
+    "title": "登录日志",
+    "description": "监控所有认证事件，包括登录、登出与注册。"
+  },
+  "dataChanges": {
+    "title": "数据变更日志",
+    "description": "追踪系统所有数据变更（增删改），保障合规。"
+  }
+}