Add standalone server chat command "help" and "?"

[MhaWay]

Summary

• add help and ? chat commands for standalone server command discovery
• show command descriptions and usage text, including help details
• improve invalid command feedback to point users to built-in help

Testing

• dotnet build .\Source\Server\Server.csproj -c Release

[MhaWay]

1.6, enhancement, standalone server

[Copilot]

Pull request overview

Adds built-in chat command discovery for server commands, including aliases and detailed help output.

Changes:

• Registers help and ? chat commands during server initialization.
• Adds command metadata for descriptions and usage.
• Improves invalid-command feedback to point users toward help.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
Source/Common/MultiplayerServer.cs	Registers the new help command and ? alias.
Source/Common/ChatCommands.cs	Adds command metadata, help listing/detail behavior, and updated invalid command messages.

Comments suppressed due to low confidence (2)

Source/Common/ChatCommands.cs:123

• This hint is also shown to in-game players, but player chat commands must be entered with a leading / before the server strips it. For a ServerPlayer, this should point to /help rather than help; otherwise the suggested follow-up is sent as normal chat and does not run the command.

            source.SendMsg($"Unknown command '{args[0]}'. Use help to list available commands.");

Source/Common/ChatCommands.cs:137

• This usage hint is sent through the same help command to both console and in-game chat sources. In-game players need to type /help <command>, not help <command>, so please render the usage with the chat prefix when source is ServerPlayer and keep the bare form for console input.

        source.SendMsg("Use help <command> for detailed usage.");

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