fix: update cache control headers to s-maxage=1 to prevent stale data…

[desireddymohithreddy0925]

Description

Fixes #7803

The SVG endpoints (such as /api/streak, /api/stats, etc.) were previously setting a Cache-Control header of s-maxage=3600. Because GitHub caches external images using its own Camo proxy, this high max-age meant that users wouldn't see their updated commit stats for up to an hour after making a contribution.

This PR updates the buildCacheControlHeader utility and all associated API routes to return s-maxage=1, stale-while-revalidate=59. This dramatically reduces the hard caching duration while still allowing CDNs to serve stale content gracefully while revalidating in the background, ensuring near real-time updates for SVG widgets embedded in READMEs. All relevant unit tests testing cache bounds were updated to reflect this new optimal configuration.

Pillar

• 🎨 Pillar 1 — New Theme Design
• 📐 Pillar 2 — Geometric SVG Improvement
• 🕐 Pillar 3 — Timezone Logic Optimization
• 🛠️ Other (Bug fix, refactoring, docs)

Checklist before requesting a review:

• I have read the CONTRIBUTING.md file.
• I have tested these changes locally (localhost:3000/api/streak?user=YOUR_USERNAME).
• I have run npm run format and npm run lint locally and resolved all errors (CI will fail otherwise).
• My commits follow the Conventional Commits format (e.g., feat(themes): ..., fix(calculate): ...).
• I have updated README.md if I added a new theme or URL parameter.
• I have started the repo.
• I have made sure that i have only one commit to merge in this PR.
• The SVG output matches the CommitPulse "premium quality" aesthetic standard (no raw elements, smooth animations, correct fonts).
• (Recommended) I joined the CommitPulse Discord community for contributor discussions, mentorship, and faster PR support.

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📦 Next.js Bundle Size Report (Gzipped Sizes)

✨ No significant bundle size changes detected.

📊 Summary of Totals

Category	PR Size	Base Size	Difference
Total JS	3917.41 KB	3917.41 KB	0 B
Total CSS	325.86 KB	325.86 KB	0 B