Add settings_local.json override system

[Fuzzwah]

Summary

Adds support for a settings_local.json file that overrides default settings without modifying tracked files.

Problem

When developing or running Mindcraft on different machines, you need different settings (host, port, profiles, etc.). Currently this requires modifying settings.js, which causes git conflicts when switching branches or pulling updates.

Solution

• Load settings_local.json on top of defaults in settings.js if it exists
• Add settings_local.json to .gitignore so it's never tracked
• Include settings_local.json.example as a template
• Document the feature in README.md

Usage

cp settings_local.json.example settings_local.json
# Edit with your local settings
node main.js

Example settings_local.json:

{
    "minecraft_version": "1.21.8",
    "host": "192.168.1.100",
    "port": 25565,
    "auto_open_ui": false,
    "profiles": [
        "./profiles/gemini.json"
    ]
}

Benefits

• Switch branches freely without losing local config
• No more merge conflicts on settings.js
• Easy to share development setups via the example file
• Only override settings you need - defaults still apply

[Sweaterdog]

@Fuzzwah Can you explain why this would be better than just copying your settings.js file between instances?

[Fuzzwah]

@Sweaterdog Because as I'm making changes to the code, I'm git pulling and git pushing between my workstation and the host that runs mindcraft. Since my host has changes to the server.js each time I need to deal with the conflict (stashing the local change, pulling, then popping).