feat(auth-files): add file size validation for uploads

src/i18n/locales/en.json

@@ -312,6 +312,7 @@
     "delete_all_confirm": "Are you sure you want to delete all auth files? This operation cannot be undone!",
     "delete_filtered_confirm": "Are you sure you want to delete all {{type}} auth files? This operation cannot be undone!",
     "upload_error_json": "Only JSON files are allowed",
+    "upload_error_size": "File size cannot exceed {{maxSize}}",
     "upload_success": "File uploaded successfully",
     "download_success": "File downloaded successfully",
     "delete_success": "File deleted successfully",

src/i18n/locales/zh-CN.json

@@ -312,6 +312,7 @@
     "delete_all_confirm": "确定要删除所有认证文件吗？此操作不可恢复！",
     "delete_filtered_confirm": "确定要删除筛选出的 {{type}} 认证文件吗？此操作不可恢复！",
     "upload_error_json": "只能上传JSON文件",
+    "upload_error_size": "文件大小不能超过 {{maxSize}}",
     "upload_success": "文件上传成功",
     "download_success": "文件下载成功",
     "delete_success": "文件删除成功",

src/pages/AuthFilesPage.tsx

@@ -81,6 +81,7 @@ const OAUTH_PROVIDER_PRESETS = [
 const OAUTH_PROVIDER_EXCLUDES = new Set(['all', 'unknown', 'empty']);
 const MIN_CARD_PAGE_SIZE = 3;
 const MAX_CARD_PAGE_SIZE = 30;
+const MAX_AUTH_FILE_SIZE = 50 * 1024;
 
 const clampCardPageSize = (value: number) =>
   Math.min(MAX_CARD_PAGE_SIZE, Math.max(MIN_CARD_PAGE_SIZE, Math.round(value)));
@@ -372,18 +373,29 @@ export function AuthFilesPage() {
     const filesToUpload = Array.from(fileList);
     const validFiles: File[] = [];
     const invalidFiles: string[] = [];
+    const oversizedFiles: string[] = [];
 
     filesToUpload.forEach((file) => {
-      if (file.name.endsWith('.json')) {
-        validFiles.push(file);
-      } else {
+      if (!file.name.endsWith('.json')) {
         invalidFiles.push(file.name);
+        return;
       }
+      if (file.size > MAX_AUTH_FILE_SIZE) {
+        oversizedFiles.push(file.name);
+        return;
+      }
+      validFiles.push(file);
     });
 
     if (invalidFiles.length > 0) {
       showNotification(t('auth_files.upload_error_json'), 'error');
     }
+    if (oversizedFiles.length > 0) {
+      showNotification(
+        t('auth_files.upload_error_size', { maxSize: formatFileSize(MAX_AUTH_FILE_SIZE) }),
+        'error'
+      );
+    }
 
     if (validFiles.length === 0) {
       event.target.value = '';