fix(dashboard): prevent auto-SSO redirect for basic auth provider

[frannnnk]

When only the Basic Auth (password) provider is registered, the middleware incorrectly attempts to auto-initiate an OAuth redirect flow, leading to a NotImplementedError. This patch skips the auto-SSO logic if the single registered provider is 'basic'.

[alt-glitch]

This was generated by AI during triage.

Duplicate of #54887 (earliest open canonical fix) -- same supports_password / skip-auto-SSO-for-password-only guard in hermes_cli/dashboard_auth/middleware.py fixing the NotImplementedError 500 when the sole registered provider is basic. Sibling PRs #57427/#56627 and issues #55130/#58237/#57220/#57868 are the same cluster; #55130 is the earliest open issue anchor.

[teknium1]

Thanks for the focused dashboard-auth fix. This is an automated hermes-sweeper review; the requested behavior is already implemented on current main.

• Commit 3e24b16f566045399012bc1185fe0cdb6e1a1be9 added the capability-based guard at hermes_cli/dashboard_auth/middleware.py:212: a sole provider with supports_password=True falls through to /login rather than auto-starting OAuth.
• The same change hardens direct requests at hermes_cli/dashboard_auth/routes.py:195, redirecting password providers to /login before start_login() could raise.
• Current regression coverage at tests/hermes_cli/test_dashboard_auth_password_login.py:201 verifies the password-provider redirect and form rendering.

The existing implementation is broader than this PR's provider.name == "basic" check because it covers all password-capable providers.