ops: add post-deploy verification script and add to CI/CD workflow

- scripts/verify-deploy.sh: checks container health, /health endpoint, and Stripe checkout
- .forgejo/workflows/deploy.yml: runs verify-deploy.sh after successful deploy

.forgejo/workflows/deploy.yml

@@ -85,6 +85,10 @@ jobs:
             sleep 5
           done
           
+          # Run post-deploy verification
+          echo "🔍 Running post-deploy verification..."
+          bash scripts/verify-deploy.sh
+          
           # Cleanup old rollback images (keep last 5)
           echo "🧹 Cleaning up old rollback images..."
           docker images --format "table {{.Repository}}:{{.Tag}}" | grep "docfast-docfast:rollback-" | tail -n +6 | awk '{print $1":"$2}' | xargs -r docker rmi || true