Fix: Ollama connection by updating default endpoint

[AliYmn]

I made this pr because I've seen a lot of problems about "Connection Refused".

When using Ollama with Browser-Use, the default endpoint http://localhost:11434/ causes connection refused errors because the Docker container cannot access the host machine's localhost. This PR updates the default Ollama endpoint to use http://host.docker.internal:11434/, allowing the container to communicate with Ollama running on the host machine properly.

[warmshao]

Will this affect users who are not running with docker containers?

[AliYmn]

@warmshao In fact, since we set it as the default value, anyone can change it, the purpose here is to solve 90% of the cases because http://localhost:11434/ is used in this way. I think the default ‘http://localhost:11434/’ makes more sense than using it this way.