I can't make it work with Gemini Agent

As the only providers that can be defined in the configuration parameters are OpenAI, Azure and LiteLLM, I tried using LiteLLM as a proxy for my Gemini account by defining the following parameters in the .env file :

```
LITELLM_API_KEY="XXXXXXXXXX"
BASE_URL="https://generativelanguage.googleapis.com"

ORCHESTRATOR_AGENT_PROVIDER="gemini/"
ORCHESTRATOR_AGENT_MODEL="gemini-2.5-flash"
LOCATOR_AGENT_PROVIDER="gemini/"
LOCATOR_AGENT_MODEL="gemini-2.5-flash"
```

When running Robot Framework (using SeleniumLibrary) with a broken XPath on purpose and after looking at SelfHealingReports logs, the function get_client_model returns None.

Has anyone have experience with making robotframework-selfhealing-agents work with Gemini agent ? (through LiteLLM or another method)

Start by tracing get_client_model from the SelfHealingReports logs and reviewing how the .env provider and model parameters are interpreted. Reproduce the broken XPath case with the shown LiteLLM and Gemini settings, then verify that a client/model is resolved and self-healing completes through SeleniumLibrary.

Written by the indexing model from the issue text.