Use protocol media registry for static types

[samuel-williams-shopify]

Summary

• replace mime-types with protocol-media-registry for static file media types
• make configured extensions explicit, including separate webm and weba entries
• use the registry’s more specific audio/vorbis and audio/speex mappings
• remove obsolete Annodex entries and update static middleware documentation

Memory usage

Incremental RSS was sampled with process-metrics in fresh Ruby 4.0.6 processes. Each result is the median of 20 runs, except the fallback measurement which used 12 runs.

Library	Require only	After 46 Utopia lookups
mime-types 3.7.0	4.89 MiB	4.98 MiB
protocol-media-registry 0.1.0 native	1.33 MiB	1.53 MiB
protocol-media-registry Ruby fallback	5.00 MiB	5.03 MiB

The native registry saves approximately 3.5 MiB, or 70% of incremental RSS, after lookups. The memory improvement depends on the native index loading successfully; the Ruby fallback uses approximately the same memory as mime-types.

Testing

• bundle exec sus test/utopia/static.rb
• bundle exec rubocop lib/utopia/static/mime_types.rb lib/utopia/static/middleware.rb test/utopia/static.rb utopia.gemspec

The full suite reached 324 passing tests; four command-generation tests errored while creating temporary bundles because the local vendor/bundle contains native extensions built against a different Ruby build.