Build an auth code input component that allows users to enter a 6-digit authorization code and submit it to a mock API.

Requirements:

Input Behavior:
- Render six individual input fields. Each allows exactly one digit (0-9).
- Entering a valid digit automatically moves focus to the next input (unless it's the last one).
Keyboard Controls:
- Hitting Backspace clears the current field if it has a value.
- If the current field is empty, Backspace moves focus to the previous field.
Paste Support:
- Pasting a string of numbers should clear all fields, distribute the pasted characters across the inputs, and focus the appropriate field.
Form Controls:
- Submit button: Disabled until all 6 fields are filled.
- Reset button: Clears all fields. Disabled if all fields are empty.
API Integration:
- On submit, make a POST request to https://questions.greatfrontend.com/api/questions/auth-code-input with { otp: '6_DIGIT_OTP' }.
- The API returns HTTP 204 if the OTP is '123456' (success), and HTTP 403 otherwise. Use an alert() to display the result.