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Answer a route opening with an optional segment without it under a namespace

A route's path is assembled by joining its mount path, prefix, version,
namespace and own path with slashes. A path opening with an optional
group, such as get '(:type)' inside namespace :root, compiled to
/root/(:type): the slash outside the group was required, and a request
path is normalized without a trailing slash, so /root answered 404. The
same went for a mount path, a prefix, a path version, and a slash
written in front of the group, as in get 'users/(:id)'.

The slash in front of an optional group now goes inside it, as
/root(/:type), the spelling that already worked when written out in
full. A slash opening the path stays where it is, so / still matches
/(:type).

Fixes #932.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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