gh: add PR template

.github/pull_request_template.md

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+## Description
+
+<!-- What does this PR do and why? -->
+
+## Type of change
+
+<!-- Check all that apply. -->
+
+- [ ] Bug fix (non-breaking change that fixes an issue)
+- [ ] New feature (non-breaking change that adds functionality)
+- [ ] Breaking change (fix or feature that changes existing behavior)
+- [ ] Refactor / internal cleanup
+- [ ] Documentation
+- [ ] Other
+
+## Related issues
+
+<!-- e.g. "Fixes #123", "Closes #123". Leave blank if none. -->
+
+## Screenshots / video
+
+<!-- Include screenshots or a video for any user-facing or visual change. -->
+
+## Checklist
+
+- [ ] My code follows the conventions in CONTRIBUTING.md
+- [ ] I have tested my changes locally
+- [ ] New user-facing strings are wrapped in `I18n.tr()` with translator context, reusing existing terms where possible
+- [ ] Go changes: ran `make fmt`, added/updated tests, `make test` passes, and `go mod tidy` is clean
+- [ ] QML changes: ran `make lint-qml` with no new warnings
+- [ ] I have opened a corresponding pull request in dlx-docs to document any new behaviors: https://github.com/AvengeMedia/DankLinux-Docs