* docs(auth): correct login help to reflect actual default + SSH guidance (#226)
The --help long description for `dws auth login` claimed the default mode was
"OAuth 设备流 (默认)", but the actual default starts a 127.0.0.1 loopback
listener (oauth_provider.go:131-136) and only switches to device flow when
--device is passed. SSH-into-headless-Linux users following the docs hit a
dead end because the local browser cannot reach 127.0.0.1 on the remote box.
Rewrite the description so each method is named after its real flag:
- OAuth Loopback 流 (默认)
- OAuth 设备流 (--device)
- 直接提供 Token (--token)
Add an explicit warning callout and a `--device` example for SSH/headless
environments. Also realign two flagErrorWithSuggestions strings in root.go
that propagated the same misconception ("默认使用设备流" → loopback default,
SSH 用户加 --device).
No behavioural change.
* docs(auth): drop emoji from login help warning
When logging in with --client-id and --client-secret, credentials are now
automatically persisted to enable automatic token refresh after expiration.
Client secret is securely stored in system Keychain, config file only
contains a reference.
