feat(logging): add runtime log levels and debug log export (#241)

Add a System setting for Off/Normal/Debug logging, apply readable local timestamps to backend logs, and enable exporting buffered runtime logs to a file when debug mode is active.

Co-authored-by: Maxim Isaev <im@friclub.ru>

src/locales/zh.ts

@@ -647,6 +647,14 @@ export const zhTranslation = {
     tabServer: '服务器',
     tabUsers: '用户',
     tabSystem: '系统',
+    loggingTitle: '日志记录',
+    loggingModeDesc: '控制终端中后端日志的详细程度。',
+    loggingModeOff: '关闭',
+    loggingModeNormal: '普通',
+    loggingModeDebug: '调试',
+    loggingExport: '导出日志',
+    loggingExportSuccess: '日志已导出（{{count}} 行）。',
+    loggingExportError: '无法导出日志。',
     tabGeneral: '通用',
     ratingsSectionTitle: '评分',
     ratingsSkipStarTitle: '跳过以评 1 星',