fix: types did not allow openai config vars even though code passes t…

[LukFil]

Problem

OpenAI wrapper does not accept OpenAI config on the type level, even though code passes them correctly.

Changes

Made MonitoringOpenAIConfig extend ClientOptions of OpenAI.

Release info Sub-libraries affected

Bump level

• Major
• Minor
• Patch

Libraries affected

• All of them
• posthog-web
• posthog-node
• posthog-ai
• posthog-react-native

Changelog notes

• Synced types for OpenAI client with code.

[greptile-apps]

PR Summary

This PR extends OpenAI configuration types to properly support all OpenAI client options while maintaining type safety in the PostHog AI wrapper.

• Extended MonitoringOpenAIConfig interface in /posthog-ai/src/openai/index.ts to inherit from OpenAI's ClientOptions type
• Redundant apiKey and baseURL declarations in MonitoringOpenAIConfig should be removed since they're already in ClientOptions
• Type casting of baseURL to (this as any).baseURL should be refactored to maintain type safety

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