Refactor: public vs internal `services`

[AJGeel]

Via Bulletproof react:
https://github.com/alan2207/bulletproof-react/blob/master/docs/project-structure.md

---

(Extract copied from the link above ☝️ )

Everything from a feature should be exported from the index.ts file which behaves as the public API of the feature.

You should import stuff from other features only by using:

import {AwesomeComponent} from "@/features/awesome-feature"

and not

import {AwesomeComponent} from "@/features/awesome-feature/components/AwesomeComponent

This can also be configured in the ESLint configuration to disallow the later import by the following rule:

{
    rules: {
        'no-restricted-imports': [
            'error',
            {
                patterns: ['@/features/*/*'],
            },
        ],

    // ...rest of the configuration
}