<!-- Please fill out the following content for a feature request. --> Many users sit behind a proxy and therefore need to be able to configure their proxy settings. - The [OpenAI Api allows to configure proxy settings](https://github.com/openai/openai-node/blob/3c326626c1035d43ee184cedc9084a7d399331df/README.md?plain=1#L584-L604). - Theia already offers [some proxy settings](https://github.com/eclipse-theia/theia/blob/4612d3daad9c98c4165d483fb8c835851a691b48/packages/core/src/browser/core-preferences.ts#L138-L168). [This was reported by the community](https://github.com/eclipse-theia/theia/discussions/14316). <!-- Please provide a clear description of the feature and any relevant information. --> ### Feature Description: - Leverage Theia's proxy settings to configure the Open AI Api accordingly - If possible, do the same for the other providers, i.e. Ollama and Llamafile