fix: use GH_PAT for PR creation (GITHUB_TOKEN can't create PRs)

Author: Patel230

.github/workflows/evolve.yml

@@ -46,7 +46,7 @@ jobs:
           OPENCODE_BASE_URL: https://opencode.ai/zen/go/v1
           ITERATE_PROVIDER: opencode
           ITERATE_MODEL: kimi-k2.5
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_TOKEN: ${{ secrets.GH_PAT }}
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           DISCORD_WEBHOOK_URL: ${{ secrets.DISCORD_WEBHOOK_URL }}
         run: |