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/types.ts

@@ -167,6 +167,7 @@ export interface VisibleApps {
 export interface WebDavSyncStatus {
   lastSyncAt?: number | null;
   lastError?: string | null;
+  lastErrorSource?: string | null;
   lastRemoteEtag?: string | null;
   lastLocalManifestHash?: string | null;
   lastRemoteManifestHash?: string | null;
@@ -175,6 +176,7 @@ export interface WebDavSyncStatus {
 // WebDAV v2 同步配置
 export interface WebDavSyncSettings {
   enabled?: boolean;
+  autoSync?: boolean;
   baseUrl?: string;
   username?: string;
   password?: string;