chore(api): use .env.production on server, .env for local dev only

Load production env without .env override; sync-api-env targets .env.production; PM2 NODE_ENV=production; Prisma uses with-api-env.cjs on deploy.

Co-authored-by: Cursor <cursoragent@cursor.com>

deploy/remote-continue-m-domain.sh

@@ -17,7 +17,7 @@ nginx -t
 systemctl reload nginx
 
 echo "==> 3. 更新 USER_H5_URL"
-ENV_FILE="$APP_ROOT/server/dukang-api/.env"
+ENV_FILE="$APP_ROOT/server/dukang-api/.env.production"
 if grep -q '^USER_H5_URL=' "$ENV_FILE"; then
   sed -i "s|^USER_H5_URL=.*|USER_H5_URL=${H5_BASE}/user|" "$ENV_FILE"
 else