Migrate March 2020 server auth to Open.IdentityServer

[Alexa-RR]

Summary

• Replace Duende IdentityServer package/namespaces with Open.IdentityServer.
• Retarget server-side projects and Docker images to .NET 10 because Open.IdentityServer 1.0.0 requires net10.0.
• Remove license-key wiring and license-status UI.
• Update ASP.NET/EF Core/Redis packages on the .NET 10 line and pin MessagePack 3.1.7 to clear the MessagePack advisories.
• Keep the game client auth flow on the native recroom client credentials.

Verification

• C:\Users\Alexa\.dotnet\dotnet.exe build DorkNet.Server\DorkNet.Server.csproj --nologo
• npm run build in DorkNet.Server\admin-ui
• C:\Users\Alexa\.dotnet\dotnet.exe list DorkNet.Server\DorkNet.Server.csproj package --vulnerable --include-transitive

Notes

• This worktree does not include a server test project.
• MessagePack advisories are cleared.
• SQLitePCLRaw.lib.e_sqlite3 2.1.11 remains as a transitive EF Core SQLite advisory; NuGet currently has no patched SQLitePCLRaw.lib.e_sqlite3 release beyond 2.1.11.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch auth/identityserver-march-2020

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