When is_local=True, the Ollama host URL previously hardcoded port 11434,
ignoring the port specified in provider_server_address in config.ini.
Users who need to run Ollama on a non-default port (e.g. because 11434
is already in use) had no way to configure this without editing source code.
Now the port is extracted from provider_server_address when present,
falling back to 11434 if only a hostname is given.
