feat(settings): add database backup management

public/locales/zh.json

@@ -752,7 +752,23 @@
     "memberContactBirthdayHint": "此成员自动与联系人和生日同步。",
     "memberBirthDateInvalid": "请使用所选日期格式的有效出生日期。",
     "memberPhoneMeta": "电话：{{value}}",
-    "memberBirthdayMeta": "生日：{{date}}"
+    "memberBirthdayMeta": "生日：{{date}}",
+    "tabBackup": "备份管理",
+    "sectionBackup": "备份管理",
+    "backupDownloadTitle": "下载数据库备份",
+    "backupDownloadHint": "创建包含所有应用数据的一致 SQLite 备份。",
+    "backupDownloadButton": "下载备份",
+    "backupRestoreTitle": "恢复数据库备份",
+    "backupRestoreHint": "恢复会替换当前数据库。继续前请先下载新的备份。",
+    "backupDropzoneTitle": "将备份文件拖到这里，或点击选择",
+    "backupDropzoneHint": "SQLite 备份文件：.db、.sqlite 或 .sqlite3",
+    "backupRestoreButton": "恢复备份",
+    "backupRestoreConfirm": "恢复此备份将为所有用户替换当前数据库。继续吗？",
+    "backupRestoring": "正在恢复...",
+    "backupRestoredToast": "数据库已恢复。正在重新加载...",
+    "backupCliTitle": "CLI / Docker Compose 恢复",
+    "backupCliHint": "对于运维恢复，请将备份挂载到容器并运行恢复助手。",
+    "backupCliBackupHint": "也可以直接通过 Docker Compose 创建备份："
   },
   "login": {
     "tagline": "家庭规划。安全。注重隐私。开源。",