ci: add .NET 10 SDK to build; scope publish to SDK project only

The audit-fix branch left the test project on net10.0 (which is LTS as
of Nov 2025), but the workflows only installed .NET 6 + 8, so restore
would fail on master.

- build.yml: install 10.0.x alongside 6.0.x and 8.0.x so the test
  project restores and runs.
- publish.yml: restore/build/pack the SDK project explicitly instead
  of the whole repo, so packaging cannot be blocked by an unrelated
  test-project framework. The SDK itself still only needs 6/8.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: H-Ashrafi

.github/workflows/build.yml

@@ -19,6 +19,7 @@ jobs:
         dotnet-version: |
           6.0.x
           8.0.x
+          10.0.x
 
     - name: Restore dependencies
       run: dotnet restore

.github/workflows/publish.yml

@@ -15,20 +15,22 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 8.0.x
+        dotnet-version: |
+          6.0.x
+          8.0.x
 
     - name: Extract version from tag
       id: get_version
       run: echo "VERSION=${GITHUB_REF#refs/tags/v}" >> $GITHUB_OUTPUT
 
-    - name: Restore dependencies
-      run: dotnet restore
+    - name: Restore SDK project
+      run: dotnet restore LicenseManagement.Client.csproj
 
-    - name: Build
-      run: dotnet build --configuration Release --no-restore -p:Version=${{ steps.get_version.outputs.VERSION }}
+    - name: Build SDK
+      run: dotnet build LicenseManagement.Client.csproj --configuration Release --no-restore -p:Version=${{ steps.get_version.outputs.VERSION }}
 
     - name: Pack
-      run: dotnet pack --configuration Release --no-build -p:Version=${{ steps.get_version.outputs.VERSION }} --output ./nupkg
+      run: dotnet pack LicenseManagement.Client.csproj --configuration Release --no-build -p:Version=${{ steps.get_version.outputs.VERSION }} --output ./nupkg
 
     - name: Push to NuGet
       run: dotnet nuget push ./nupkg/*.nupkg --api-key ${{ secrets.NUGET_API_KEY }} --source https://api.nuget.org/v3/index.json --skip-duplicate