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Readability: case/when, guard clauses, small cleanups (#2684)

Mechanical readability refactors across validators, DSLs, and formatters:

- inside_route.rb: sendfile dispatched via case/when on value type.
- parameters.rb: map_params switched to case/when; EmptyOptionalValue
  simplified to a frozen Object.new; method order tidied.
- error_formatter/json.rb: wrap_message dispatched via case/when.
- middleware/formatter.rb: guard-clause returns in ensure_content_type
  and read_rack_input; bodies.collect -> bodies.map.
- validations/types.rb: create_coercer_instance rewritten as a
  priority-list of guards with comments above each branch; shared
  array_or_set? predicate extracted; redundant Types. prefix dropped.
- validations/types/primitive_coercer.rb: reject? rewritten as case/when
  with String/Array|Hash dispatch.
- validators/except_values_validator.rb: lift except.is_a?(Proc) to a
  local to avoid recomputing it.

No behavior change.

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

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