fix: add PR template — reviewer checklist (#1558)

.gitea/pull_request_template.md

@@ -0,0 +1,23 @@
+## Description
+
+<!-- What does this PR do? -->
+
+## Changes
+
+- [ ] 
+
+## Testing
+
+- [ ] 
+
+## Reviewer Checklist
+
+**IMPORTANT: Do not rubber-stamp. Verify each item below.**
+
+- [ ] **PR has actual changes** — check additions, deletions, and changed files are > 0
+- [ ] **Changes match description** — the code changes match what the PR claims to do
+- [ ] **Code quality** — no obvious bugs, follows conventions, readable
+- [ ] **Tests are adequate** — new code has tests, existing tests pass
+- [ ] **Documentation updated** — if applicable
+
+**By approving, I confirm I have actually reviewed the code changes in this PR.**