Keep EF Core at 9.0.11 for Microting package compatibility

The runtime test confirmed that Microting packages are not binary compatible with EF Core 10.x. Reverted EF Core packages to 9.0.11 while keeping Swashbuckle 10.0.1:
- Microsoft.EntityFrameworkCore.InMemory: 10.0.0 → 9.0.11
- Microsoft.AspNetCore.Mvc.NewtonsoftJson: 10.0.0 → 9.0.11
- Swashbuckle.AspNetCore: remains at 10.0.1 (with updated Startup.cs)

This configuration:
- Uses the maximum .NET 10 packages possible (Swashbuckle 10.0.1)
- Maintains EF Core 9.x for Microting compatibility
- Updates Startup.cs to modern API (compatible with both versions)
- Builds successfully and avoids MissingMethodException

Co-authored-by: renemadsen <[email protected]>

Author: Copilot

eFormAPI/eFormAPI.Web/eFormAPI.Web.csproj

@@ -52,8 +52,8 @@
     <PackageReference Include="HtmlToOpenXml.dll" Version="3.2.8" />
     <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="10.0.0" />
     <PackageReference Include="Microsoft.AspNetCore.Identity.UI" Version="10.0.0" />
-    <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="10.0.0" />
-    <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="10.0.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="9.0.11" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="9.0.11" />
     <PackageReference Include="Microsoft.Extensions.PlatformAbstractions" Version="1.1.0" />
     <PackageReference Include="Microting.eForm" Version="9.0.72" />
     <PackageReference Include="Microting.EformAngularFrontendBase" Version="9.0.59" />