[Feature]: Authorization to API using signature from blockchain

### Description of feature request

```shell
Implement authorization using the blockchain to make HTTP requests using signature https://explorer.kryptokrona.se/tools.html

This should be optional setting for the host of Hugin Cache to use if necessary.
```

### Why is this needed

_No response_

### Code of Conduct

- [X] I agree to follow this project's Code of Conduct

No files, tests, or entry points are named. Start by reviewing the hugin-api HTTP API and how the Hugin Cache host is configured, then inspect the linked Kryptokrona signing reference. Done should include a defined optional authorization setting, request-signature behavior, and tests for enabled and disabled modes.

Written by the indexing model from the issue text.