feat: Add issue templates for bug reports and feature requests, and update PR template

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,28 @@
+# Summary
+
+<!-- What does this PR change, and why? Keep it brief. -->
+
+## Changes
+
+- Describe the changes here
+
+## Screenshots / recordings (optional)
+
+<!-- If you changed the TUI UI/UX, add a screenshot or short recording. -->
+
+## How to test
+
+- [ ] `dotnet build src/EchoHub.slnx`
+- [ ] `dotnet test src/EchoHub.slnx`
+
+## Checklist
+
+- [ ] I ran tests locally (or explained why not)
+- [ ] I kept changes focused and easy to review
+- [ ] I updated docs where needed (README/docs)
+- [ ] I verified no secrets/keys are committed
+- [ ] If this touches files/uploads/auth, I considered security implications
+
+## Related issues
+
+- Closes #