refactor(ollama): local process

Refactor local process handling for Ollama using a container implementation
avoiding the wrapping methods.

This defaults to running the binary with an ephemeral port to avoid port
conflicts. This behaviour can be overridden my setting OLLAMA_HOST either
in the parent environment or in the values passed via WithUseLocal.

Improve API compatibility with:

- Multiplexed output streams
- State reporting
- Exec option processing
- WaitingFor customisation

Fix Container implementation:

- Port management
- Running checks
- Terminate processing
- Endpoint argument definition
- Add missing methods
- Consistent environment handling