feat: add WebDAV support

[InvestigatorDoofy]

• Introduced WebDavConfig and WebDavUploadItem models for configuration and upload tracking.
• Implemented WebDavProvider to manage upload queue and configuration state.
• Added WebDavService for handling WebDAV operations including file uploads and connection testing.
• Created WebDavSettingsPage for user configuration of WebDAV settings.
• Integrated WebDAV upload functionality into the download queue process.
• Added necessary UI components in settings and upload queue to display and manage WebDAV uploads.
• Updated pubspec.yaml to include webdav_client dependency.

[coderabbitai]

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