REST API Client Layer Generator

Create a type-safe API client for [API_name]. Requirements:
- Define TypeScript interfaces for all request and response shapes
- Create a base client class/function with:
  - Base URL configuration from environment variables
  - Default headers (Content-Type, Authorization)
  - Request/response interceptors
  - Automatic JSON parsing
  - Timeout configuration
  - Retry logic with exponential backoff (3 attempts)
- Create individual endpoint methods (getUser, createOrder, etc.)
- Handle HTTP errors with typed error responses
- Support request cancellation with AbortController
- Add request/response logging in development mode
- Export a singleton instance and the types
- Do NOT add new HTTP client dependencies — use fetch()
- Include usage examples as JSDoc comments