feat(webdav): follow-up 补齐自动同步与大文件防护 (#1043)

* feat(webdav): add robust auto sync with failure feedback

(cherry picked from commit bb6760124a62a964b36902c004e173534910728f)

* fix(webdav): enforce bounded download and extraction size

(cherry picked from commit 7777d6ec2b9bba07c8bbba9b04fe3ea6b15e0e79)

* fix(webdav): only show auto-sync callout for auto-source errors

* refactor(webdav): remove services->commands auto-sync dependency

src/i18n/locales/en.json

@@ -283,6 +283,8 @@
       "passwordPlaceholder": "App password",
       "remoteRoot": "Remote Root Directory",
       "profile": "Sync Profile Name",
+      "autoSync": "Auto Sync",
+      "autoSyncHint": "When enabled, each database change triggers an automatic WebDAV upload.",
       "test": "Test Connection",
       "testing": "Testing...",
       "testSuccess": "Connection successful",
@@ -294,11 +296,14 @@
       "uploading": "Uploading...",
       "uploadSuccess": "Uploaded to WebDAV",
       "uploadFailed": "Upload failed: {{error}}",
+      "autoSyncFailedToast": "Auto sync failed: {{error}}",
       "download": "Download from Cloud",
       "downloading": "Downloading...",
       "downloadSuccess": "Downloaded and restored from WebDAV",
       "downloadFailed": "Download failed: {{error}}",
       "lastSync": "Last sync: {{time}}",
+      "autoSyncLastErrorTitle": "Last auto sync failed",
+      "autoSyncLastErrorHint": "Please check network or WebDAV settings. Auto sync will retry on future changes.",
       "missingUrl": "Please enter the WebDAV server URL",
       "presets": {
         "label": "Provider",

src/i18n/locales/ja.json

@@ -283,6 +283,8 @@
       "passwordPlaceholder": "アプリパスワード",
       "remoteRoot": "リモートルートディレクトリ",
       "profile": "同期プロファイル名",
+      "autoSync": "自動同期",
+      "autoSyncHint": "有効にすると、データベース変更のたびに WebDAV へ自動アップロードします。",
       "test": "接続テスト",
       "testing": "テスト中...",
       "testSuccess": "接続成功",
@@ -294,11 +296,14 @@
       "uploading": "アップロード中...",
       "uploadSuccess": "WebDAV にアップロードしました",
       "uploadFailed": "アップロードに失敗しました：{{error}}",
+      "autoSyncFailedToast": "自動同期に失敗しました：{{error}}",
       "download": "クラウドからダウンロード",
       "downloading": "ダウンロード中...",
       "downloadSuccess": "WebDAV からダウンロード・復元しました",
       "downloadFailed": "ダウンロードに失敗しました：{{error}}",
       "lastSync": "前回の同期：{{time}}",
+      "autoSyncLastErrorTitle": "前回の自動同期に失敗しました",
+      "autoSyncLastErrorHint": "ネットワークまたは WebDAV 設定を確認してください。次回の変更時に自動再試行されます。",
       "missingUrl": "WebDAV サーバー URL を入力してください",
       "presets": {
         "label": "サービス",

src/i18n/locales/zh.json

@@ -283,6 +283,8 @@
       "passwordPlaceholder": "应用密码（坚果云请使用「第三方应用密码」）",
       "remoteRoot": "远程根目录",
       "profile": "同步配置名",
+      "autoSync": "自动同步",
+      "autoSyncHint": "开启后每次数据库变更都会自动上传到 WebDAV。",
       "test": "测试连接",
       "testing": "测试中...",
       "testSuccess": "连接成功",
@@ -294,11 +296,14 @@
       "uploading": "上传中...",
       "uploadSuccess": "已上传到 WebDAV",
       "uploadFailed": "上传失败：{{error}}",
+      "autoSyncFailedToast": "自动同步失败：{{error}}",
       "download": "从云端下载",
       "downloading": "下载中...",
       "downloadSuccess": "已从 WebDAV 下载并恢复",
       "downloadFailed": "下载失败：{{error}}",
       "lastSync": "上次同步：{{time}}",
+      "autoSyncLastErrorTitle": "上次自动同步失败",
+      "autoSyncLastErrorHint": "请检查网络或 WebDAV 配置，系统会在后续变更时继续自动重试。",
       "missingUrl": "请填写 WebDAV 服务器地址",
       "presets": {
         "label": "服务商",