Surface the username/password dashboard-auth provider in Hermes Desktop's
remote-gateway connect flow. A password gateway gates the same way an OAuth
one does (auth_required + session cookie + ws-ticket), so the desktop already
drives it through the existing sign-in window; the only gaps were that the
probe dropped supports_password and the UI always said "OAuth".
- main.cjs: capture supports_password from /api/auth/providers in the probe.
- global.d.ts: add optional supportsPassword to DesktopAuthProvider.
- gateway-settings.tsx: derive isPasswordProvider; render a plain "Sign in"
button + "username and password" copy instead of an OAuth provider label
when every advertised provider is password-based. Login still flows through
the gateway's /login credential form (POST /auth/password-login).
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