feat: open router proxy

[MichalKalita]

Closes: https://github.com/apify/ai-team/issues/16

I created main part with proxy to Open Router.

It exists as actor in https://console.apify.com/actors/sxck9mShRCfmMOZ8S/source

It works simply, just make proxy for /api/v1 into open router servers. Stream response directly to request. And in the end read cost and call Actor.charge. Actors cannot have dynamic charge prices, so exist only one event with price $0.001 and real cost is made by count.

[jirimoravcik]

Thanks, had some comments

[jirispilka]

@MichalKalita please add this in the PR description to automatically close the issue: Closes: https://github.com/apify/ai-team/issues/16

[jirispilka]

Thank you. I like that you used FastifyProxy, it makes code really simple.

I left a couple of minor comments.

[MichalKalita]

I added a readme with examples and a 10% fee. I hope all feedback was applied to the code.

[jirispilka]

Looks good to me. I noticed there are some unresolved comments or questions from Jiri M. If you’ve already addressed them, I’d suggest marking them as resolved.

[jirispilka]

@MichalKalita for reference: Apify writing style

[MQ37]

LGTM, good job 👍 Only two minor comments