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Promote route metadata to Route keyword arguments

`version`, `namespace`, `prefix`, `requirements`, `anchor` and `settings`
were computed in `Endpoint#prepare_default_route_attributes`, merged into
the route options Hash, and read back through `Grape::Router::BaseRoute`'s
`def_delegators :@options`. They are route metadata, not part of the
user-declared options bag grape-swagger consumes.

They are now passed to `Grape::Router::Route` as explicit keyword
arguments and exposed as plain readers on `BaseRoute`. `Endpoint#to_routes`
computes each as a local and passes `config.route_options` straight
through, so `prepare_default_route_attributes` (and the intermediate
`default_route_options`/`complete_route_options`) is gone. `Route`
forwards the attributes to `super` via `**route_attributes` to keep its
signature lean.

`route.options` now carries only what was declared for the route; the
`@options` delegation is down to `description` plus the documentation
`DSL_METHODS`. The readers are unchanged, so grape-swagger (which reads
`route.prefix` and `route.settings`) is unaffected. `requirements` and
`anchor` can still be declared as route options, so any explicit value
stays in `route.options`; the effective value comes from the reader.

Also drop the vestigial `:format` member from the endpoint's `Options`.
Nothing ever passed `format:` to `Grape::Endpoint.new`, so `config.format`
was always `nil`; the format capture comes from the path suffix built by
`Grape::Path`, not from `Pattern`'s `format`. `Pattern#initialize` keeps
`format:` (now optional) since it remains a valid capture constraint used
by external callers.

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

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