Fix API hostname formatting for proper URL construction.

[davidlambl]

This PR addresses an issue where API hostname configuration causes connection errors with llama-cpp-python servers (showing errors like "Cannot connect to host http:80").

Changes Made:

• Modified the format_url function in utils.py to properly handle URL construction
• Added protocol stripping from hostnames to prevent duplication
• Improved port handling to ensure correctly formatted URLs
• Ensures proper URL formation for all combinations of hostname/port/protocol

Testing:

1. Tested with a llama-cpp-python server on LAN at http://192.168.1.100:8000
2. Configure with protocol in hostname (e.g., "http://192.168.1.100:8000")
3. Configure without protocol (e.g., "192.168.1.100" with port "8000")
4. Test with and without port specifications
5. Verify connection succeeds with properly formatted URLs

Fixes #220

[acon96]

This PR is out of date