feat(interceptors): add global request/response interceptors

[usernane]

Problem

Cannot transform requests or responses globally (like Axios interceptors).

Suggestion

Add static interceptor registration.

Example API

// Request interceptor
AJAXRequest.interceptors.request.use(config => {
  config.headers['Authorization'] = 'Bearer ' + token;
  return config;
});

// Response interceptor  
AJAXRequest.interceptors.response.use(response => {
  // Transform response
  return response;
});