feat(all): add game SDK and harden client login and game rules

- Add costume burst upgrades with durable replay and fix permanent SR equipment gacha.
- Add server game.json rules for optional collaboration UR weapons, with packaging and documentation.
- Add GameNames/GameSdk NuGet tooling, readable types, reobfuscation, complete source/PDB navigation and shared-runtime installation.
- Split plugin responsibilities, prefer typeof/nameof, centralize MSBuild settings and ignore local paths; remove the unused LoginUI test project.
- Fix login recovery and TLS through native platform HTTP and a private game relay; read device region directly from the OS time zone.

Validation: go test ./... -count=1, go vet ./..., plugin Release builds, SDK/runtime self-tests, Roslyn embedded-source navigation, gofmt check and git diff --check.

plugins/VersionSource.targets

@@ -1,8 +1,4 @@
 <Project>
-  <PropertyGroup>
-    <BD2VersionConfig>$([System.IO.Path]::GetFullPath('$(MSBuildThisFileDirectory)..\versions.json'))</BD2VersionConfig>
-    <BD2GeneratedVersionSource>$([System.IO.Path]::GetFullPath('$(MSBuildProjectDirectory)\obj\$(Configuration)\$(TargetFramework)\Bd2Versions.g.cs'))</BD2GeneratedVersionSource>
-  </PropertyGroup>
   <Target Name="GenerateBD2VersionSource" BeforeTargets="CoreCompile">
     <Error Condition="!Exists('$(BD2VersionConfig)')" Text="Missing repository version config: $(BD2VersionConfig)" />
     <Exec Command="powershell -NoProfile -ExecutionPolicy Bypass -File &quot;$(MSBuildThisFileDirectory)Generate-VersionSource.ps1&quot; -Config &quot;$(BD2VersionConfig)&quot; -Output &quot;$(BD2GeneratedVersionSource)&quot; -Plugin &quot;$(BD2PluginVersionKey)&quot;" />