CONV-159: Implement result download route

[menvil]

DownloadConversionResultController already implemented in CONV-155. Fixing lint in test file.

🤖 Generated with Claude Code

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Summary by cubic

Remove an unused import in the conversion result download test to fix lint errors. This ties off CONV-159, with the route implemented in CONV-155 and the test suite kept clean.

^{Written for commit 5d93e38. Summary will update on new commits.}

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