Rework WebDAV workspace setup to use .onyx-workspace.json instead of
.metadata.json and to let users pick a remote folder instead of forcing
an Onyx/ subfolder. This updates storage, sync, config types, tests, and
CLI/Tauri commands to store a webdav_path in WorkspaceConfig and to
combine webdav_url + webdav_path for sync.
Changes include:
- Rename .metadata.json → .onyx-workspace.json across storage, sync, and tests so workspace detection and root metadata use the new filename.
- Remove hardcoded automatic "Onyx/" subfolder in sync and use the user-selected remote path directly.
- Add webdav_path field to WorkspaceConfig (Rust and TypeScript types) and thread it through add_webdav_workspace and frontend addWebdavWorkspace.
- Add three Tauri commands (list_remote_folder, inspect_remote_workspace, create_remote_workspace) to support remote folder browsing, workspace preview, and remote workspace creation.
- Rewrite SetupScreen WebDAV flow to Connect → Browse (lazy folder explorer) → Preview or Create, and wire UI state/handlers to the new commands.
- Update CLAUDE.md to document the new on-disk filename and note development phase allowing breaking changes.
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