fix: paginate commit fetch in weekly-summary and hourly endpoints

[Neal006]

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• Bug fix
• New feature
• Documentation update
• Refactor / code cleanup

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[Priyanshu-byte-coder]

The pagination logic is correct and needed. However, this PR still uses session.accessToken directly in both modified routes. PR #876 (security fix) removes accessToken from the session object — once that merges, these routes will return unauthorized for every request. Please update to use getGitHubAccessToken(req) from @/lib/server-github-token (same pattern being introduced in #876). Also note that weekly-summary/route.ts is also modified in #876, so you will need to rebase after that merges.

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