Added missing GROK model provider key initialization

[FabriceIRANKUNDA]

Relates to:

#295

Risks

Low: This change is low risk, as it only introduces a new case for an additional model provider in an existing switch statement.

Background

What does this PR do?

This PR adds initialization for the GROK model provider key in the getTokenForProvider function. Previously, the function did not handle the GROK model provider, potentially leading to issues if the provider was selected without a corresponding key.

What kind of change is this?

• Feature: This is a non-breaking change that adds functionality by supporting a new model provider (GROK).

Documentation changes needed?

Yes

Testing

Where should a reviewer start?

The review should focus on the getTokenForProvider function in the relevant file, ensuring that the added GROK case aligns with the structure of other model provider cases.

Detailed testing steps

• Confirm that selecting ModelProviderName.GROK successfully returns the appropriate API key from character.settings?.secrets?.GROK_API_KEY or settings.GROK_API_KEY.

Deploy Notes

No special deployment instructions.

Database changes

None.

Deployment instructions

Standard deployment steps apply.