docs: add pull request template

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+<!-- What does this PR do? Keep it brief. -->
+
+## Type of change
+
+- [ ] 🐛 Bug fix
+- [ ] ✨ New feature
+- [ ] ♻️ Refactor (no behavior change)
+- [ ] 📝 Documentation
+- [ ] 🎨 Style / UI
+- [ ] ⚡ Performance
+- [ ] 🧪 Tests
+- [ ] 🔧 CI / tooling
+
+## Checklist
+
+- [ ] `npm run lint` passes with 0 errors
+- [ ] `npm run build` succeeds
+- [ ] `npm test` passes
+- [ ] Tested in Dark, Light, and OLED themes
+- [ ] Mobile-responsive (375px+)
+- [ ] i18n keys added for new user-facing strings (EN + FR)
+- [ ] No secrets or `.env` values committed
+- [ ] Commit messages follow [Conventional Commits](https://www.conventionalcommits.org/)
+
+## Screenshots (if UI change)
+
+<!-- Before/after screenshots or a short description of what changed visually. -->