Admin autofill breaks on cors errors

[evs-xsarus]

🪲 Describe the bug
The new admin autofill in 3.7.0 can give cors errors if the admin is run on another domain than the frontend. All calls seem to go to a frontend controller.

🔄 To Reproduce
Have multiple stores and configure a different domain for each (including store 0/admin).

• Create a new order in the admin.
• Search for an adress.

✅ Expected behaviour
The addresses should be found.

⚙️ Environment

• Magento version and edition: 2.4.7-p9
• Other checkout-related modules: hyva
• PHP version: 8.3

💡 Additional context
Maybe create a backend controller so that the lookup in the admin can use admin URLs.

[JerrySmidt]

Version 4.1.0 has an admin controller for autocomplete requests, which should fix this issue.