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/types.ts

@@ -162,6 +162,36 @@ export interface VisibleApps {
   opencode: boolean;
 }
 
+// WebDAV v2 同步状态
+export interface WebDavSyncStatus {
+  lastSyncAt?: number | null;
+  lastError?: string | null;
+  lastRemoteEtag?: string | null;
+  lastLocalManifestHash?: string | null;
+  lastRemoteManifestHash?: string | null;
+}
+
+// WebDAV v2 同步配置
+export interface WebDavSyncSettings {
+  enabled?: boolean;
+  baseUrl?: string;
+  username?: string;
+  password?: string;
+  remoteRoot?: string;
+  profile?: string;
+  status?: WebDavSyncStatus;
+}
+
+// 远端快照信息（下载前预览）
+export interface RemoteSnapshotInfo {
+  deviceName: string;
+  createdAt: string;
+  snapshotId: string;
+  version: number;
+  compatible: boolean;
+  artifacts: string[];
+}
+
 // 应用设置类型（用于设置对话框与 Tauri API）
 // 存储在本地 ~/.cc-switch/settings.json，不随数据库同步
 export interface Settings {
@@ -206,6 +236,9 @@ export interface Settings {
   // Skill 同步方式：auto（默认，优先 symlink）、symlink、copy
   skillSyncMethod?: SkillSyncMethod;
 
+  // ===== WebDAV v2 同步设置 =====
+  webdavSync?: WebDavSyncSettings;
+
   // ===== 终端设置 =====
   // 首选终端应用（可选，默认使用系统默认终端）
   // macOS: "terminal" | "iterm2" | "warp" | "alacritty" | "kitty" | "ghostty"