CONV-301: Add converter schema endpoint

[menvil]

Summary

• Adds GET /api/v1/converters/{source}/{target}/schema returning options schema for converter pair
• Returns 422 unsupported_conversion for invalid pairs via domain exception mapping
• Implementation already in ConverterController::schema() from CONV-300

Test plan

• Valid pair returns {data: {source_format, target_format, options}}
• Unsupported pair → 422 unsupported_conversion
• Missing API key → 401
• composer test passes (558 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Adds GET /api/v1/converters/{source}/{target}/schema to return the options schema for a converter pair. Fulfills Linear CONV-301 with clear error handling and auth.

• New Features
  • Route added to ConverterController::schema().
  • Valid pairs return data.source_format, data.target_format, and data.options.
  • Unsupported pairs return 422 with error.code = unsupported_conversion.
  • Requires API key; unauthenticated requests return 401.

^{Written for commit b43cab2. Summary will update on new commits.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/CONV-301-add-converter-schema-endpoint

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