Webdav (#923)

* feat: WebDAV backup/restore

- Add WebDAV test/backup/restore commands and settings\n- Fix ja i18n missing keys; decode PROPFIND href as UTF-8\n- Stabilize Windows prompt auto-import tests via CC_SWITCH_TEST_HOME

* chore: format and minor cleanups

* fix: update build config

* feat(webdav): unify sync UX and hardening fixes

* fix(webdav): harden sync flow and stabilize sync UX/tests

* fix(webdav): add resource limits to skills.zip extraction

Prevent zip bomb / resource exhaustion by enforcing:
- MAX_EXTRACT_ENTRIES (10,000 files)
- MAX_EXTRACT_BYTES (512 MB cumulative)

* refactor(webdav): drop deviceId and display deviceName only

---------

Co-authored-by: small-lovely-cat <77799160+small-lovely-cat@users.noreply.github.com>
Co-authored-by: saladday <1203511142@qq.com>

src-tauri/src/lib.rs

@@ -886,6 +886,11 @@ pub fn run() {
             // theirs: config import/export and dialogs
             commands::export_config_to_file,
             commands::import_config_from_file,
+            commands::webdav_test_connection,
+            commands::webdav_sync_upload,
+            commands::webdav_sync_download,
+            commands::webdav_sync_save_settings,
+            commands::webdav_sync_fetch_remote_info,
             commands::save_file_dialog,
             commands::open_file_dialog,
             commands::open_zip_file_dialog,