Add tests and CI

[GeiserX]

Add vitest tests with CI workflow and coverage.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: a0f690b0-820f-4e00-8ee1-f612734c7066

📥 Commits

Reviewing files that changed from the base of the PR and between 3f2c794 and 5b8c2db.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json, !**/package-lock.json

📒 Files selected for processing (13)

• .github/workflows/ci.yml
• README.md
• package.json
• src/app/api/exchange-rates/route.test.ts
• src/lib/brand.test.ts
• src/lib/config.test.ts
• src/lib/og-translations.test.ts
• src/lib/photon.test.ts
• src/lib/valhalla.test.ts
• src/middleware.test.ts
• src/scrapers/spain.test.ts
• src/types/fuel.test.ts
• vitest.config.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/add-tests

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