Add PR template

.github/pull_request_template.md

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+## What does this PR do?
+
+<!-- A clear, concise description of the change. Link any related issues. -->
+
+Fixes #
+
+## Why is this change needed?
+
+<!-- What problem does it solve? What's the motivation? -->
+
+## How was this tested?
+
+<!-- Describe how you verified the change works. Include steps to reproduce if applicable. -->
+
+- [ ] Tested locally with `docker build` + `docker run`
+- [ ] Tested the setup wizard flow end-to-end
+- [ ] Verified gateway proxy still works after changes
+
+## Screenshots (if applicable)
+
+<!-- Add screenshots for UI changes -->
+
+## Checklist
+
+- [ ] My changes don't break existing functionality
+- [ ] I've tested with a existing volume (pre-existing config)
+- [ ] I've tested with a fresh volume (no pre-existing config)