feat(settings,questions,school,textbooks): add brand config, question components, school dialogs, textbooks hooks

settings:

- Add actions-brand, brand-config, data-access-brand for brand management

- Add admin-file-upload-card, admin-notification-config-card, admin-school-info-card, admin-security-policy-card

- Add ai-provider-delete-dialog, ai-provider-selector, brand-config-card

- Add security-recent-logins-section, security-two-factor-section

- Add config/profile-overview-config, data-access-profile-overview, lib/system-settings-utils

questions:

- Add batch-operations, import-export-buttons, knowledge-point-selector, options-editor

- Add question-bank-results-client, question-cascade-filter, question-content-renderer, utils

school:

- Add grade-delete-dialog, grade-form-dialog, grade-list-toolbar, grade-overview-cards

- Add use-grade-data hook

textbooks:

- Add textbook-form-fields component

- Add use-kp-create, use-kp-delete, use-kp-update hooks

src/modules/settings/components/avatar-upload.tsx

@@ -29,7 +29,8 @@ const MAX_FILENAME_LENGTH = 255
  * 头像上传组件
  *
  * 支持上传新头像、预览、删除。
- * 文件通过 /api/upload 上传，成功后调用 Server Action 更新 users.image。
+ * 文件通过 /api/upload 上传（targetType="user_avatar" 已注册到 FileTargetType 枚举），
+ * 成功后调用 Server Action 更新 users.image。
  */
 export function AvatarUpload({
   currentImage,
@@ -72,7 +73,7 @@ export function AvatarUpload({
 
     setUploading(true)
     try {
-      // 上传文件到 /api/upload
+      // 上传文件到 /api/upload，targetType="user_avatar" 已注册到 FileTargetType 枚举
       const formData = new FormData()
       formData.append("file", file)
       formData.append("targetType", "user_avatar")