CONV-306: Add conversion status endpoint

[menvil]

Summary

• Adds GET /api/v1/conversions/{conversion} returning id/status/progress/formats/timestamps
• Ownership enforced: other user gets 403
• Uses ConversionResource and ConversionController::show()

Test plan

• Returns correct status shape for queued job
• Other user's conversion → 403
• Missing API key → 401
• composer test passes (578 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Adds a public status endpoint to fetch a conversion job’s status and formats. Enforces API key auth and ownership to meet CONV-306 requirements.

• New Features
  • GET /api/v1/conversions/{conversion} returns: id, status, progress, source_format, target_format, created_at, started_at, completed_at.
  • 401 when missing API key; 403 when accessing another user’s job.

^{Written for commit 67299e6. 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-306-add-conversion-status-endpoint

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