When KEYCLOAK_URL is not set, the dashboard runs without auth,
treating all users as authenticated "Local User". Auth middleware
and check-auth endpoint gracefully skip when Keycloak is unconfigured.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Dashboard: OAuth2/OIDC login flow with PKCE, session-based auth middleware
protecting all server function endpoints, check-auth server function for
frontend auth state, login page gate in AppShell, user info in sidebar.
Agent API: JWT validation middleware using Keycloak JWKS endpoint,
conditionally enabled when KEYCLOAK_URL and KEYCLOAK_REALM are set.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Sharang Parnerkar <parnerkarsharang@gmail.com>
Reviewed-on: #2
