fix: return structured error when GitHub App is not installed (issue #53)

[tmdeveloper007]

Summary

Improves error messaging when a user attempts to update billing settings for a repository where the GitHub App is not installed. Previously returned a generic 404. Now returns a structured 503 response with a specific error code and setup guidance.

Issue

Fixes #53: Add GitHub App installation check + better error messaging

Changes

• Added structured error response with code: "GITHUB_APP_NOT_INSTALLED"
• Added setupUrl pointing to GitHub App installation page
• Added human-readable message guiding the user to install the GitHub App
• Changed HTTP status from 404 to 503 (Service Unavailable — dependency not configured)

UI Impact

Frontend can now detect GITHUB_APP_NOT_INSTALLED and show a guided message with a direct link to install the GitHub App, instead of a generic error.

Files Changed

• app/api/repositories/[id]/billing/route.ts

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Review details

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Configuration used: Organization UI

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Run ID: b4b776a7-069f-48ac-9448-32c11631b57d

📥 Commits

Reviewing files that changed from the base of the PR and between 07ceab7 and c4b123c.

📒 Files selected for processing (1)

• app/api/repositories/[id]/billing/route.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[github-actions]

🎉 Thanks for your contribution, @tmdeveloper007!

Your PR has passed our automated GSSoC quality checks. Here's a quick summary:

Check	Status
PR description	✅ Provided
PR title	✅ Meaningful
Linked issue	✅ Found
Change size	✅ Looks good (9 lines across 1 file(s))

A maintainer will review your PR soon. Please be patient and available for feedback. 💪

GSSoC'26 automation · Maintainer: @nisshchayarathi

[tmdeveloper007]

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