fix(dashboard): skip auto-sso for password auth

[ai-hand]

Summary

• Avoid auto-SSO redirects for password-only dashboard auth providers
• Let the /login page render the username/password form instead of calling OAuth start_login() on the basic provider
• Add regression coverage for single password-provider dashboard auth

Test Plan

• python -m pytest tests/hermes_cli/test_dashboard_auth_401_reauth.py::TestAutoSsoRedirect tests/plugins/dashboard_auth/test_basic_provider.py -q -o 'addopts='

[alt-glitch]

This was generated by AI during triage.

Duplicate of #54887 (earliest-open canonical fix). This PR adds the byte-for-byte identical if getattr(provider, "supports_password", False): return None guard in _auto_sso_response() (hermes_cli/dashboard_auth/middleware.py) as #54887, into which several siblings (#54958, #58007, #57427) already dedup. Related to merged regression source #54846 and the broader-scope sibling #58171.

[teknium1]

Closing as a duplicate — #54887 (opened Jun 29) is the earliest canonical PR for this fix and contains the byte-identical supports_password guard in _auto_sso_response(). Nothing here to salvage on top of it; the triage bot already linked the sibling duplicates (#54958/#58007/#57427). Thanks for the report regardless.