Add unit tests for builder payload shape

[WcaleNieWolny]

Summary

• Extract buildBuilderPayload() from inline fetch() body in the build request proxy
• Add 6 vitest unit tests asserting the forwarded JSON shape to the builder

What's tested

1. build_options (snake_case) maps to buildOptions (camelCase)
2. build_credentials (snake_case) maps to buildCredentials (camelCase)
3. Legacy flat credentials field is NOT present
4. userId, artifactKey, fastlane present with correct values
5. Exact top-level key set (no extra keys)
6. Contents pass through unchanged

Context

Companion to #1717 (forward split payload). Ensures the snake_case → camelCase mapping and payload shape contract are regression-tested.

Test plan

• npx vitest run tests/builder-payload.unit.test.ts — 6/6 pass

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch test/builder-payload-shape

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud