Use a tenant-specific login page. The frontend now starts with `request-auth-mode` and then continues with OTP or password based on the tenant policy.
Domain-based tenant routing resolves the tenant from the hostname.
For example, visiting http://rp.localhost:3000/tenant-domains/rp.localhost/login uses the domain-based tenant login route.
Slug-based tenant routing resolves the tenant from the path segment.
For example, visiting http://localhost:3000/tenant-slugs/rp-jr-college/login uses the slug-based tenant login route.