fix(ci): remove environment block causing startup_failure

The GitHub environment 'production' was causing startup_failure on all
workflow_dispatch runs (0 jobs started). Remove the environment reference
to unblock deployments. Can be re-added once the root cause is identified.

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

.github/workflows/deploy-production.yml

@@ -204,9 +204,6 @@ jobs:
     runs-on: ubuntu-latest
     needs: [preflight, pre-tests, backup]
     if: always() && (needs.pre-tests.result == 'success' || needs.pre-tests.result == 'skipped') && (needs.backup.result == 'success' || needs.backup.result == 'skipped')
-    environment:
-      name: production
-      url: ${{ env.PRODUCTION_URL }}
     steps:
       - name: Checkout code
         uses: actions/checkout@v4