fix(deploy): use deploy user for file ownership instead of www-data

Changing ownership to www-data at end of deploy breaks permission
handling when pm2 runs as a different user (e.g., root or the deploy
user). Keep ownership as the deploy user throughout.

.gitea/workflows/deploy.yaml

@@ -377,7 +377,7 @@ jobs:
           # Prisma client is gitignored — regenerate into live src/generated.
           pnpm prisma:generate
 
-          sudo chown -R www-data:www-data "${LIVE}" 2>/dev/null || true
+          sudo chown -R "${DEPLOY_USER}:${DEPLOY_GROUP}" "${LIVE}" 2>/dev/null || true
 
           echo "Starting PM2 (zero-downtime reload)..."
           pm2 reload next --update-env || pm2 start next --update-env