chore:removed await from non async function

[urizennnn]

Description

This PR removes deprecated functions and improves code encapsulation. Specifically:

• Replaces toPromise() by directly handling the firstValueFrom data response.
• Ensures that await is only used in async functions.
• Updates function visibility where necessary (public → private or protected).
• Fixed constructuor/service function to reference values using the ts this keyword correctly.

Related Issue

Fixes #1220

Type of Change

• feat: New feature
• fix: Bug fix
• docs: Documentation updates
• style: Code style/formatting changes
• refactor: Code refactoring
• perf: Performance improvements
• test: Test additions/updates
• chore: Build process or tooling changes
• ci: CI configuration changes
• other:

How Has This Been Tested?

• Unit tests
• Integration tests
• Manual tests

Test Evidence

✅ All tests passed. (See attached screenshot)

Screenshots (if applicable)

Documentation Screenshots (if applicable)

Checklist

• My code follows the project's coding style
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published
• I have included a screenshot showing all tests passing
• I have included documentation screenshots (if applicable)

Additional Notes

This refactor ensures the stability and maintainability of the codebase by removing deprecated features and enforcing better encapsulation.