refactor(api): extract cache-control header builder into a utility function

[JhaSourav07]

🧩 Background

app/api/streak/route.ts and app/api/github/route.ts both compute Cache-Control header strings inline using similar ternary expressions.

🎯 Objective

Create utils/cacheControl.ts exporting buildCacheControlHeader({ refresh, random, secondsToMidnight }): string.

📁 Files to touch

• utils/cacheControl.ts (new)
• app/api/streak/route.ts
• app/api/github/route.ts

🛠️ Implementation steps

• Define the helper.
• Add unit tests for all three branches (no-cache, no-store, s-maxage).
• Use from both routes.

✅ Definition of done

• Helper is tested.
• Routes use the helper.
• Existing route tests pass.

[github-actions]

Hey @JhaSourav07! 🤖

My semantic scan detected that this issue might be a duplicate of #320 (Similarity: 86.0%).

Please check between these issues and close this one if it is a duplicate.

[surya0904shankar]

/assign surya0904shankar I request you to assign this issue to me

[Pratikshya32]

Hello @JhaSourav07! /claim

[gaurav123-4]

@JhaSourav07 Assign me the issue so that i can start working on it .

[github-actions]

👋 Hey @gaurav123-4! Looks like you want to work on this issue — awesome! 🎉

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[surya0904shankar]

/claim