CONV-311: Add API happy path feature test

[menvil]

Summary

• Adds full end-to-end happy path: upload → targets → estimate → create conversion → check status
• Verifies estimate doesn't create jobs, status returns queued
• Confirms all business endpoints require API key auth (401 without token)
• Credits balance check included in happy path

Test plan

• Full API flow passes with Queue::fake() and Storage::fake()
• All 5 business endpoints return 401 without API key
• Credits balance returns correct amount
• composer test passes (596 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Implements CONV-311 by adding an end-to-end API happy path test that covers upload → targets → estimate → create conversion → status, plus the credits balance endpoint. Verifies API key auth (401 without token), confirms estimate does not create jobs, and ensures new conversions start in the queued state.

^{Written for commit fb9cb51. 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-311-add-api-happy-path-feature-test

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