fix(ci): use body-path for refresh PR body

peter-evans/create-pull-request expects 'body-path', not 'body-file'; the invalid input was ignored so the refresh PR fell back to the default body. Rename so the validation summary + per-source enrich details land in the PR.

Author: Seungpyo1007

.github/workflows/weekly-refresh.yml

@@ -161,7 +161,7 @@ jobs:
             site/public/openapi.json
           commit-message: "chore(data): weekly refresh ${{ steps.meta.outputs.date }}"
           title: "chore(data): weekly refresh ${{ steps.meta.outputs.date }}"
-          body-file: pr-body.md
+          body-path: pr-body.md
           committer: techengine-bot <techengine-bot@users.noreply.github.com>
           author: techengine-bot <techengine-bot@users.noreply.github.com>
           delete-branch: true