fix(formatHost): support basic auth in host URL

[somprasongd]

🔧 Description

This pull request adds support for Basic Authentication in the formatHost function by including username and password from the input URL into the formatted result.

📌 Motivation

Ollama does not provide built-in security or authentication mechanisms. To protect access to the service—especially in shared or production environments—many users set up a reverse proxy like Nginx to enforce Basic Authentication.

For example:

http {
    server {
        listen 80;

        auth_basic "Restricted";
        auth_basic_user_file /etc/nginx/.htpasswd;

        location / {
            proxy_pass http://localhost:11434;
        }
    }
}

With this configuration, requests to Ollama require valid credentials. In order for clients to successfully communicate through the reverse proxy, they must include credentials in the request URL (e.g., http://user:pass@host:port). This PR ensures that such credentials are preserved in the formatted host string, enabling compatibility with secured proxy setups.

✅ Changes

Preserve username and password (if provided) in the output of formatHost.

No impact on behavior for URLs without basic auth.

Maintains removal of trailing slashes and default port logic.

🧪 Example

formatHost('http://admin:1234@localhost:11434/')
// Output: 'http://admin:1234@localhost:11434'

🧪 Added Tests

Comprehensive test cases have been added for:

• Username only
• Username + password
• Default port cases
• HTTPS with credentials
• Custom ports
• URLs with and without trailing slashes

[josx]

I also need this support too.
Because i want to use cline which depends on this lib.

[BruceMacD]

This looks good, thanks for the contribution!