Request - UI for customisation of apps_windows.json

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Feature request - customise and add "applications" to the moonlight menu in addition to the default Desktop and Stream BigPicture via an easy to use window for adding/removing entries in the apps_windows.json file.

I know I can add new apps to the list but maybe have a front-end for customising this list in the future possibly? In the meantime, maybe publish a "how to" syntax for adding them manually (backing up the original in case they blow it up).

For instance, i added genshin impact to the list easily but with a bit of errors while trying to get the syntax correct for the json file:

`
{
"env":{
"PATH":"$(PATH);C:\\Program Files (x86)\\Steam"
},
"apps":[
{
"name":"Steam BigPicture",

"output":"steam.txt",
"prep-cmd":[
{"do":"steam \"steam://open/bigpicture\""}
]
},
{
"name":"Genshin Impact",
"output":"genshin.txt",
"cmd":"K:\\FPrograms\\Genshin Impact\\launcher.exe"
}
]
}
`

Start by locating apps_windows.json and the existing Moonlight menu implementation. Review how the default Desktop and Stream BigPicture entries are represented, then define the requested add/remove workflow for custom applications. Done means users can manage these entries through an easy-to-use window without manually editing the JSON.

Written by the indexing model from the issue text.