feat(router): auto-discover module routes from modules/*/config/routes.php
Each module now owns its config/routes.php. RouteCollectorFactory globs
module route files and loads routes.local.php itself (moved out of
config/routes.php). Updated routes.local.php.example to return a callable.
module route files and loads routes.local.php itself (moved out of
config/routes.php). Updated routes.local.php.example to return a callable.