Make LiveryColour struct fields public for deserialization access

[Copilot]

The LiveryColour struct fields were private, preventing consumers from reading decoded RGB values after binary deserialization.

Changes

• Made red, green, blue fields public in LiveryColour struct

Field names preserve lowercase convention to match F1 game's C++ telemetry specification:

[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct LiveryColour
{
    public byte red;
    public byte green;
    public byte blue;
}

This aligns with other F1 telemetry structs that expose fields directly for binary interop.

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