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Merge routing args in place in Router#process_route (#2754)

process_route built `args = env[GRAPE_ROUTING_ARGS] || { route_info: route }`
and then reassigned `env[GRAPE_ROUTING_ARGS] = args.merge(route_params)`, which
allocates a second Hash for every matched route that carries params.

Set the routing-args Hash once with `||=` and `merge!` the route params into it
in place, dropping the extra allocation. The resulting routing args are
identical (same keys and values); only the merge is now in-place. `route_params`
is a freshly built Hash, so nothing shared is mutated.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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