✨ [REQUEST] Mealie - add OpenAI support

[tillmannschatz]

Checked

• If a new addon, I have checked on Google that such as addon doesn't already exists
• If a new feature, I have searched in the discussions & issues that it was not already covered

Which addon?

Mealie

Is your feature request related to a problem? Please describe

As OpenAI integration is condigured in the Backend, this option needs to be made available in the Addon Configuration in Home Assistant.

Describe the solution you'd like

Add OpemAI Backend Configuration Options to Home Assistant UI Addon Configuration:

See: https://docs.mealie.io/documentation/getting-started/installation/backend-config/#openai