[Optimizing] Improve code layering of ozhera-prometheus-agent module

[psxjoy]

Description

Some controller classes in the project currently use implementation classes of interfaces for dependency injection. While this method allows the project to function properly, it does not adhere to modern code layering practices and may lead to difficulties with future scalability and maintenance.

Optimize

Separate interfaces from their implementation classes, ensuring standardized usage.

Linked Module:

ozhera-prometheus-agent