Adds dynamic OS-selected socket port handling and secured Electron/.NET communication.
The dotnet-first startup flow now generates the auth token on the .NET side and passes it to Electron through an environment variable. Electron reports the selected socket port through a temporary startup-info file, avoiding any dependency on parsing Electron console output.
Also avoids logging backend startup parameters because they include the auth token.
Updated all projects to target .NET 10.0, removing support for .NET 6.0. Upgraded key dependencies, including:
- `Microsoft.Build` and `Microsoft.Build.Tasks.Core` to 18.0.2.
- `Nuke.Common` to 10.1.0.
- `System.Drawing.Common` to 10.0.1.
- `System.Text.Json` to 10.0.1.
Removed `NoWarn` configurations for .NET 6.0 in `ElectronNET.AspNet.csproj`. Reformatted the `Copy` task in `ElectronNET.Build.csproj` for readability. Updated `.pubxml` files and other project files to reflect the framework upgrade.
