CONV-303: Add file target formats endpoint

[menvil]

Summary

• Adds GET /api/v1/files/{file}/targets returning available target formats for uploaded file
• Uses ConverterRegistry::targetsFor() via FileController::targets()
• Ownership enforced: only file owner can see targets; 403 otherwise
• Unsupported format returns empty list

Test plan

• PNG file returns targets including 'jpg'
• Other user's file → 403
• Missing API key → 401
• Unknown format → empty list
• composer test passes (566 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Adds GET /api/v1/files/{file}/targets to list available conversion target formats for a user's uploaded file. Fulfills Linear CONV-303.

• New Features
  • Endpoint implemented via FileController::targets() using ConverterRegistry::targetsFor().
  • Requires API key (401 if missing); only the file owner can access (403 otherwise).
  • Returns a data array with target_format, label, description, recommended; empty list for unsupported source formats.

^{Written for commit 4d41c47. 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-303-add-file-target-formats-endpoint

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