couple fixes

[sxpert]

Hi,

I have installed the integration in my system (a core install with no plugin management, I hate docker), and found that I needed to fix those 3 things

• first, there is a system variable for the configuration directory... I guess it's a good idea to use it (if we're not in docker, "/config/myhome.yaml" goes nowhere)
• when running the plugin, I got a crash because the string was malformed (missing an argument)... made it better (fixes #108 )
• fix the various constants that core was complaining about for 2025.1 (fixes #104, fixes #110 )