fix(api-gateway): ratelimit behind reverse proxy

[tuana9a]

https://express-rate-limit.mintlify.app/reference/error-codes#err-erl-unexpected-x-forwarded-for

ValidationError: The 'X-Forwarded-For' header is set but the Express 'trust proxy' setting is false (default). This could indicate a misconfiguration which would prevent express-rate-limit from accurately identifying users. See https://express-rate-limit.github.io/ERR_ERL_UNEXPECTED_X_FORWARDED_FOR/ for more information.
    at _Validations.<anonymous> (/app/node_modules/express-rate-limit/dist/index.cjs:180:15)
    at _Validations.wrap (/app/node_modules/express-rate-limit/dist/index.cjs:313:18)
    at _Validations.xForwardedForHeader (/app/node_modules/express-rate-limit/dist/index.cjs:178:10)
    at Object.keyGenerator (/app/node_modules/express-rate-limit/dist/index.cjs:542:19)
    at /app/node_modules/express-rate-limit/dist/index.cjs:595:32
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at async /app/node_modules/express-rate-limit/dist/index.cjs:576:5 {
  code: 'ERR_ERL_UNEXPECTED_X_FORWARDED_FOR',
  help: 'https://express-rate-limit.github.io/ERR_ERL_UNEXPECTED_X_FORWARDED_FOR/'
}