FEATURE REQUEST: Ability to set up API keys for servers running on LAN

Summary:

This feature would add the ability to set up a custom key or password, so that way there is no way for unknown people on LAN / WiFi to spam the Ollama server.

Proposal:

Add a switch in the Ollama app settings or a switch like OLLAMA_USE_AUTH_KEY=1 for the terminal.

Behavior

• By default, if Ollama uses localhost, keep it disabled.
• By default, if Ollama uses LAN hosting, keep it enabled.
• Users can generate a secure key or just use a password
• If uses decide to generate a key instead of use a password, the can decide whether whoever uses the key can do things like download, delete, or use Ollama models