[QA] Implement & Automate Unit Tests

[mahdibayouli]

Task:

Write unit tests for critical logic in the server and genai services, ensuring they are automatically executed in the CI pipeline.

Requirements:

• Write unit tests for the core functionality of the RAG service and GenAI integration.
• Ensure that tests are executed on every pull request as part of the CI pipeline.

Acceptance Criteria:

• Tests must be automated in the CI pipeline.
• Key logic for GenAI and server endpoints should be well-tested.