Add Application and Infrastructure projects to solution

Two new projects, `ECMJobRunner.Application` and
`ECMJobRunner.Infrastructure`, were added to the solution file
(`ECM.JobRunner.sln`). Build configurations for these projects
were also added.

`ECMJobRunner.Application.csproj` targets both .NET Framework 4.8
and .NET 8.0, with properties such as `LangVersion`, `Nullable`,
and `PackageId` defined.

`ECMJobRunner.Infrastructure.csproj` also targets .NET Framework
4.8 and .NET 8.0. It includes conditional dependencies:
- For `net480`, it references `EntityFramework` 6.5.1.
- For `net8.0`, it references `Microsoft.EntityFrameworkCore`
  and related packages (version 8.0.11).

ECMJobRunner.Infrastructure/ECMJobRunner.Infrastructure.csproj

@@ -0,0 +1,27 @@
+<Project Sdk="Microsoft.NET.Sdk">
+	<PropertyGroup>
+		<TargetFrameworks>net480;net8.0</TargetFrameworks>
+		<LangVersion>latest</LangVersion>
+		<Nullable>enable</Nullable>
+		<DocumentationFile>bin\$(Configuration)\$(TargetFramework)\$(MSBuildProjectName).xml</DocumentationFile>
+		<PackageId>EECMJobRunner.Infrastructure</PackageId>
+		<Authors>Digital Data GmbH</Authors>
+		<Company>Digital Data GmbH</Company>
+		<Product>ECMJobRunner.Domain</Product>
+		<Copyright>Copyright 2026</Copyright>
+		<RepositoryUrl>http://git.dd:3000/AppStd/ECMJobRunner.git</RepositoryUrl>
+		<PackageTags>digital data ecm job runner Infrastructure</PackageTags>
+	</PropertyGroup>
+
+	<ItemGroup Condition="'$(TargetFramework)' == 'net480'">
+		<!-- Entity Framework 6 for .NET Framework 4.8 -->
+		<PackageReference Include="EntityFramework" Version="6.5.1" />
+	</ItemGroup>
+
+	<ItemGroup Condition="'$(TargetFramework)' == 'net8.0'">
+		<!-- Entity Framework Core 8 for .NET 8 -->
+		<PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.11" />
+		<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="8.0.11" />
+		<PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="8.0.11" />
+	</ItemGroup>
+</Project>