Fix packaging for ubuntu builds

[Lancelotmay]

Issue:

In the original packaging script, libraries (.so) and runtime files into /usr/bin instead of a dedicated library folder. This caused installed executables to fail at runtime (System.DllNotFoundException) because the dynamic linker could not find libSkiaSharp and other dependencies.

Correction:

All runtime libraries (.dll, .so, .json, .pdb) and Assets are now copied to /usr/lib/aictionary.
/usr/bin/Aictionary is a small wrapper that sets LD_LIBRARY_PATH to point to /usr/lib/aictionary before launching the main executable.
This ensures both self-contained and framework-dependent packages can run correctly after installation.

Test done:

basic test on ubuntu24.04, self-contained mode

Orignal error

# Aictionary
Unhandled exception. System.TypeInitializationException: The type initializer for 'SkiaSharp.SKImageInfo' threw an exception.
 ---> System.DllNotFoundException: Unable to load shared library 'libSkiaSharp' or one of its dependencies. In order to help diagnose loading problems, consider using a tool like strace. If you're using glibc, consider setting the LD_DEBUG environment variable: 
/usr/bin/libSkiaSharp.so: cannot open shared object file: No such file or directory
/usr/bin/liblibSkiaSharp.so: cannot open shared object file: No such file or directory
/usr/bin/libSkiaSharp: cannot open shared object file: No such file or directory
/usr/bin/liblibSkiaSharp: cannot open shared object file: No such file or directory

   at SkiaSharp.SKImageInfo..cctor()
   --- End of inner exception stack trace ---
   at Avalonia.Skia.SkiaPlatform.Initialize(SkiaOptions options)
   at Avalonia.AppBuilder.SetupUnsafe()
   at Avalonia.ClassicDesktopStyleApplicationLifetimeExtensions.StartWithClassicDesktopLifetime(AppBuilder builder, String[] args, Action`1 lifetimeBuilder)
   at Aictionary.Program.Main(String[] args)
Aborted (core dumped)

[ahpxex]

非常感谢