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Refactor DSL::Routing#version: guard clause, kwargs, value object (#2716)

Three changes that touch the same method:

1. Lift the body out of `if args.any? ... end` into a
   `return @versions&.last if args.empty?` guard.

2. Replace `**options` with explicit kwargs (`using:`, `cascade:`,
   `parameter:`, `strict:`, `vendor:`) and bake the defaults into the
   signature. The per-call `reverse_merge(using: :path)` is gone.

3. Introduce `Grape::DSL::VersionOptions` (built on `Data.define`)
   as the canonical representation of resolved version options.
   Threaded end-to-end:
   - `#version` builds and stores a `VersionOptions` on
     `inheritable_setting.namespace_inheritable[:version_options]`.
   - `Path#uses_path_versioning?`, `Endpoint#build_stack`, and
     `API::Instance#cascade?` read fields via accessors instead of
     `[:key]`.
   - The versioner middleware (`Versioner::Base`) now takes a
     `VersionOptions` directly, not a Hash. `Forwardable.def_delegators`
     forwards `cascade`/`parameter`/`strict`/`vendor` to it; the four
     ivars and per-call assignments are dropped. `DEFAULT_OPTIONS`
     stores a `VersionOptions.new(...)` so direct-mount callers still
     get safe defaults.

Public `.version` DSL surface unchanged — still accepts kwargs the same
way; the value object is an internal-only representation.

`version_options` is read for exactly these five keys across the
codebase: `:using` (`endpoint.rb`, `path.rb`), and `:cascade` /
`:parameter` / `:strict` / `:vendor` (`Versioner::Base`, plus
`:cascade` in `API::Instance#cascade?`). Any other kwarg passed to
`.version` was previously swallowed by the splat with no effect.

Spec fixtures updated:

- `spec/shared/versioning_examples.rb` (14 sites): `**macro_options`
  -> `**macro_options.except(:format)`. The `:format` key stays in
  the macro hash so the test helper (`versioned_helpers.rb`) can still
  build the `HTTP_ACCEPT` header.
- `spec/grape/exceptions/invalid_accept_header_... (continued)

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