refactor(settings): split Data accordion into Import/Export and Cloud Sync

src/i18n/locales/en.json

@@ -219,7 +219,11 @@
       },
       "data": {
         "title": "Data Management",
-        "description": "Import/export configurations and backup/restore"
+        "description": "Import/export local configurations and backup/restore"
+      },
+      "cloudSync": {
+        "title": "Cloud Sync",
+        "description": "Sync data across devices via WebDAV"
       },
       "rectifier": {
         "title": "Rectifier",

src/i18n/locales/ja.json

@@ -219,7 +219,11 @@
       },
       "data": {
         "title": "データ管理",
-        "description": "設定のインポート/エクスポートとバックアップ/復元"
+        "description": "ローカル設定のインポート/エクスポートとバックアップ/復元"
+      },
+      "cloudSync": {
+        "title": "クラウド同期",
+        "description": "WebDAV でデバイス間のデータを同期"
       },
       "rectifier": {
         "title": "整流器",

src/i18n/locales/zh.json

@@ -219,7 +219,11 @@
       },
       "data": {
         "title": "数据管理",
-        "description": "导入导出配置与备份恢复"
+        "description": "导入导出本地配置与备份恢复"
+      },
+      "cloudSync": {
+        "title": "云同步",
+        "description": "通过 WebDAV 在多设备间同步数据"
       },
       "rectifier": {
         "title": "整流器",