Use hujson to load MCP list from settings.json, allowing JSON comments. Closes #4430

[vky5]

Change Summary

What and Why:

I modified the code (.//internal/command/mcp/list.go) that loads the settings.json file to use hujson, a library that extends standard JSON parsing with support for:

• Comments (//, /* */)
• Trailing commas

Because encoding/json, that was being used earlier, doesnt allow comments in json files which was causing issues.

How:

I replaced the standard json.Unmarshal flow with a new pipeline using hujson

• Read file as bytes
• Parse with hujson.Parse() → this tolerates comments
• Convert to standard JSON using hu.Standard()
• Unmarshal into Go struct with json.Unmarshal

Related to: #4430

Documentation

• [ X ] Fresh Produce
• [ X ] In superfly/docs, or asked for help from docs team
• [ X ] n/a