Convert WinGet DSC configs to Configuration 0.2 schema format

[Copilot]

winget configure validate reports missing module directives and allowPrerelease even though they're present in the files. Root cause: the files use the PowerShell DSC v3 schema format, which winget configure doesn't fully parse — it expects the WinGet Configuration 0.2 schema.

Converted all three config files (min-dev.dsc.json, min-dev.dsc.yaml, dev-plus.dsc.yaml) to the 0.2 format:

• Schema: https://aka.ms/configuration-dsc-schema/0.2
• Structure: resources wrapped under properties with configurationVersion: "0.2.0"
• Field renames: type → resource, name → directives.description, properties → settings
• Directives preserved: module on all resources, allowPrerelease: true on Microsoft.Windows.Developer resources

Before (DSC v3):

{
  "$schema": "https://raw.githubusercontent.com/PowerShell/DSC/main/schemas/2023/08/config/document.json",
  "resources": [{
    "name": "Install Git",
    "type": "Microsoft.WinGet.DSC/WinGetPackage",
    "directives": { "module": "Microsoft.WinGet.DSC" },
    "properties": { "id": "Git.Git", "source": "winget" }
  }]
}

After (WinGet 0.2):

{
  "$schema": "https://aka.ms/configuration-dsc-schema/0.2",
  "properties": {
    "configurationVersion": "0.2.0",
    "resources": [{
      "resource": "Microsoft.WinGet.DSC/WinGetPackage",
      "directives": { "description": "Install Git", "module": "Microsoft.WinGet.DSC" },
      "settings": { "id": "Git.Git", "source": "winget" }
    }]
  }
}

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