chore: enhance PR review workflow and add GLM 5 model

- Add merge conflict detection as step 2 in PR review command, surfacing
  conflicts early before the rest of the review proceeds
- Refine merge recommendations: always fix issues on the PR branch before
  merging rather than merging first and fixing on main afterward
- Update verdict definitions (MERGE / MERGE after fixes / DON'T MERGE)
  with clearer action guidance for each outcome
- Add GLM 5 model to the GLM API provider in registry
- Clean up ui/package-lock.json (remove unnecessary peer flags)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

registry.py

@@ -671,6 +671,7 @@ API_PROVIDERS: dict[str, dict[str, Any]] = {
         "requires_auth": True,
         "auth_env_var": "ANTHROPIC_AUTH_TOKEN",
         "models": [
+            {"id": "glm-5", "name": "GLM 5"},
             {"id": "glm-4.7", "name": "GLM 4.7"},
             {"id": "glm-4.5-air", "name": "GLM 4.5 Air"},
         ],