perf(ci): implement local cache for duplicate issue checking action

[MasterJi27]

Description

Fixes #5273

Pillar

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

Visual Preview

None (CI configuration change).

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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[github-actions]

📦 Next.js Bundle Size Report (Gzipped Sizes)

✨ No significant bundle size changes detected.

📊 Summary of Totals

Category	PR Size	Base Size	Difference
Total JS	3694.34 KB	3694.34 KB	0 B
Total CSS	296.06 KB	296.06 KB	0 B

[Aamod-Dev]

Implementing a local JSON cache for Gemini embeddings in .github/scripts/check-duplicates.js is a great optimization! This will significantly reduce our API calls and speed up the duplicate issue checking workflow on CI. Approved!

[github-actions]

🎉 Congratulations @MasterJi27! Your PR has been successfully merged. 🚀

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