Add Steam lobby and relay transport as an optional networking path

- add Steam lobby flow as a parallel option without removing LiteNetLib/direct connect
- add Steam relay transport wiring for Basis client/server networking
- reuse existing Basis world and prop resource pipelines for Steam sessions
- support lobby create/join, invite join, host/leave/rejoin loops
- add world BEE validation and host world bootstrap for Steam-hosted sessions
- preserve existing direct Servers flow and reset transport state correctly when leaving Steam mode
- add Steam settings asset support, optional transport trace, and setup/testing docs

Author: saint4626

Basis/Assets/Basis/Settings/Quality Settiings/Modified - Desktop.asset

@@ -27,7 +27,7 @@ MonoBehaviour:
   m_SupportsHDR: 1
   m_HDRColorBufferPrecision: 1
   m_MSAA: 2
-  m_RenderScale: 0.9987758
+  m_RenderScale: 1
   m_UpscalingFilter: 0
   m_FsrOverrideSharpness: 0
   m_FsrSharpness: 0.92

Basis/Assets/Basis/link.xml

@@ -27,12 +27,16 @@
     <assembly fullname="BasisSerializer.OdinSerializer" preserve="all" />
     <assembly fullname="BasisSettings" preserve="all" />
     <assembly fullname="BasisShims" preserve="all" />
+    <assembly fullname="BasisSteamTransport" preserve="all" />
+    <assembly fullname="BasisSteamTransportCore" preserve="all" />
     <assembly fullname="BasisVehicles" preserve="all" />
     <assembly fullname="BasisVehiclesNetwork" preserve="all" />
     <assembly fullname="BouncyCastle.Cryptography" preserve="all" />
     <assembly fullname="Cilbox" preserve="all" />
     <assembly fullname="Crypto" preserve="all" />
     <assembly fullname="Did" preserve="all" />
+    <assembly fullname="Facepunch.Steamworks.Win32" preserve="all" />
+    <assembly fullname="Facepunch.Steamworks.Win64" preserve="all" />
     <assembly fullname="GPUUtilities" preserve="all" />
     <assembly fullname="Generator.Equals" preserve="all" />
     <assembly fullname="Generator.Equals.Runtime" preserve="all" />
@@ -128,6 +132,8 @@
     <assembly fullname="openvr_api" preserve="all" />
     <assembly fullname="phonon" preserve="all" />
     <assembly fullname="phonon_fmod" preserve="all" />
+    <assembly fullname="steam_api" preserve="all" />
+    <assembly fullname="steam_api64" preserve="all" />
     <assembly fullname="ucrtbased" preserve="all" />
 
 </linker>