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Middleware tidy-up: dedupe versioner media types + Formatter cleanups (#2749)

* `Versioner::Base#build_available_media_types`: emit the bare
  `application/vnd.<vendor>-<version>` once per version instead of once
  per (version × content_type), eliminating N-1 duplicate entries per
  version in `@available_media_types`.
* `Formatter#read_body_input?`: chained `&&` rewritten as guard returns.
* `Formatter#read_rack_input`: merge parsed body into the existing
  `RACK_REQUEST_FORM_HASH` in place via `merge!` instead of allocating
  a new hash; also tolerates a nil-valued key (previously crashed).
* `Formatter#ensure_content_type`: assign content-type in place rather
  than allocating a merged headers hash.
* `Formatter#after`: drop the no-op splat on
  `status, headers, bodies = *@app_response`.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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