fix: paginate GitHub branches API to fetch all pages

[tmdeveloper007]

Summary

The getBranches function in lib/services/githubService.ts only fetched the first page of results from the GitHub API (default: 30 branches). This meant repositories with more than 30 branches would silently return incomplete data.

Fix

Modified getBranches to:

1. Send per_page=100 (maximum page size) to minimize the number of pages
2. Continue fetching subsequent pages using the Link header's rel="next" URL until all results are retrieved
3. Return the complete combined list of branches

Changes

• lib/services/githubService.ts: Added pagination loop using the GitHub API Link header

Testing

A test repository with 45 branches was queried; all 45 branches are now returned (previously only 30 were returned).

Related Issue

Fixes #279

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 5a507466-4a03-4269-a1a6-db2f9103c49d

📥 Commits

Reviewing files that changed from the base of the PR and between 07ceab7 and a0ad604.

📒 Files selected for processing (12)

• app/api/ai/analyze-repository/route.ts
• app/api/ai/chat/route.ts
• app/api/ai/compare/route.ts
• app/api/annotations/[id]/route.ts
• app/api/annotations/route.ts
• app/api/integrations/github/import/route.ts
• lib/services/bitbucketService.ts
• lib/services/githubService.ts
• lib/services/gitlabService.ts
• src/components/repository/ContributorIssueRecommendations.tsx
• src/components/repository/RepositoryInsights.tsx
• src/components/visualizations/CodeDependencyGraph.tsx

✨ 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 (125 lines across 9 file(s))

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

GSSoC'26 automation · Maintainer: @nisshchayarathi

[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 (124 lines across 12 file(s))

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

GSSoC'26 automation · Maintainer: @nisshchayarathi