fix(deps): unblock dependabot nuget updates (#166)

## Summary
- Pin `Microsoft.Extensions.Logging[.Abstractions]` from `10.0.*` to
`10.0.7` in `SharpFM.Plugin` and `SharpFM.Plugin.Tests` — floating
wildcards interact badly with dependabot's NuGet updater.
- Loosen `global.json` to `version: 10.0.100` with `rollForward:
latestMinor`, so any .NET 10 SDK satisfies the pin (prior
`latestFeature` only matched the `10.0.1xx` band).
- Add a dedicated `nuget` entry targeting `/.config` so
`dotnet-tools.json` (xamlstyler.console) gets its own update job and
isn't blocked by sln-level restore issues.

Motivation: no nuget dependabot PRs have opened since February 2025. The
github_actions ecosystem runs daily and is healthy; nuget wasn't being
dispatched at all.

Author: fuzzzerd

.github/dependabot.yml

@@ -14,6 +14,10 @@ updates:
     MicrosoftCodeAnalysis:
       patterns:
         - "Microsoft.CodeAnalysis.*"
+- package-ecosystem: "nuget"
+  directory: "/.config"
+  schedule:
+    interval: "daily"
 - package-ecosystem: "github-actions"
   directory: "/"
   schedule:

global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "10.0.104",
-    "rollForward": "latestFeature"
+    "version": "10.0.100",
+    "rollForward": "latestMinor"
   }
 }

src/SharpFM.Plugin/SharpFM.Plugin.csproj

@@ -16,7 +16,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.*" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.7" />
     <PackageReference Include="MinVer" Version="6.0.0">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>

tests/SharpFM.Plugin.Tests/SharpFM.Plugin.Tests.csproj

@@ -20,7 +20,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="Microsoft.Extensions.Logging" Version="10.0.*" />
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="10.0.7" />
   </ItemGroup>
 
   <ItemGroup>