Introduce config.skip_email_confirmation in application.rb.dist.
When set to true, new registrations are automatically confirmed
without requiring email verification — useful for installations
where outgoing email is not configured or for development/testing.
Implemented by calling skip_confirmation! in build_resource before
the record is saved, so no confirmation email is ever sent.
Also fix ArgumentError raised in length validations when
type_for_attribute(:column).limit returns nil, which happens with
SQLite for string columns that have no explicit limit in the
migration. Guard with || Float::INFINITY so the validation is
effectively skipped when the database imposes no limit.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
