Add pull request template for improved contribution guidelines

.github/pull_request_template.md

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+## Description
+
+<!-- What does this PR do? Be specific. -->
+
+## Related Issue
+
+<!-- Non-trivial changes should have a linked issue. If this is a small/obvious fix, you may leave this blank. -->
+
+Closes #
+
+## How was it tested?
+
+<!-- What did you actually run to verify this works? Be specific — "it works" is not sufficient. -->
+
+## Checklist
+
+Please check every item before marking this PR as ready for review. Unchecked items will be flagged during review.
+
+- [ ] I have read the [CONTRIBUTING.md](../blob/dev/CONTRIBUTING.md) in full
+- [ ] I understand — line by line — every change in this PR and can explain it if asked
+- [ ] This PR targets the `dev` branch
+- [ ] Backend: migrations are included if any models were changed
+- [ ] Backend: new API endpoints appear correctly in the OpenAPI schema
+- [ ] Frontend: ESLint and Prettier pass cleanly (`npm run lint`, `npm run format`)
+- [ ] Tests are included for new functionality
+- [ ] Existing tests still pass
+- [ ] No `console.log`, `print()`, debug statements, or commented-out code is left in the diff
+- [ ] I have not reformatted or refactored code outside the scope of this change