chore: remove duplicate PR template (keep uppercase version)

.github/pull_request_template.md

@@ -1,30 +0,0 @@
-## Description
-
-<!-- What does this PR do? Keep it concise. -->
-
-## Type
-
-- [ ] `feat` — New feature
-- [ ] `fix` — Bug fix
-- [ ] `docs` — Documentation only
-- [ ] `refactor` — Code change that neither fixes a bug nor adds a feature
-- [ ] `style` — Formatting, CSS, UI tweaks
-- [ ] `perf` — Performance improvement
-- [ ] `ci` — CI/CD changes
-- [ ] `chore` — Maintenance / tooling
-
-## Checklist
-
-- [ ] `npm run lint` passes with 0 errors
-- [ ] `npm run build` succeeds
-- [ ] Tested in browser (dark + light theme)
-- [ ] No hardcoded secrets or credentials
-- [ ] Commit messages follow [Conventional Commits](https://www.conventionalcommits.org/)
-
-## Screenshots
-
-<!-- If this changes the UI, add before/after screenshots. Delete this section otherwise. -->
-
-## Related Issues
-
-<!-- Closes #123, Fixes #456 — or delete this section -->