add geekai to llm provider

[geekr-dev]

Description

add geekai to llm provider, geekai is an openai compatible, unified llms interface like openrouter with lower prices

Checklist

• modified: core/llm/autodetect.ts
• modified: core/llm/llms/index.ts
• modified: docs/docusaurus.config.js
• modified: extensions/vscode/config_schema.json
• modified: packages/openai-adapters/README.md
• modified: packages/openai-adapters/src/index.ts
• modified: packages/openai-adapters/src/types.ts
• new file: core/llm/llms/GeekAI.ts
• new file: docs/docs/customize/model-providers/more/geekai.md
• new file: docs/i18n/zh-CN/docusaurus-plugin-content-docs/current/customize/model-providers/more/geekai.md

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[sestinj]

Hi @geekr-dev, I'm thinking it might make sense to just use the openai provider for this one, given that it is fully OpenAI-compatible. We're starting to have a really large number of providers and want to be careful about adding all endpoints as their own dedicated class.

I understand that you'll probably still want to make it as easy as possible for users to try your service in Continue, and for this we'll have an even better solution very soon.

I will leave this PR open for some time in order to follow up on the other solution, to make sure it doesn't get forgotten