Ability to add custom AI provider

Rather than being limited to the fixed providers, it would be good if we could add our our providers that support the OpenAI or other standards.

Name. e.g. PPQ

URL. e.g. https://api/ppg/ai/v1

API Key. e.g. hkd93nHFkFm97622

Interface Standard. openai

Model Name . gpt5.1-codex