Support official dedicated server build

[georgeciobanu]

Support current official Nuclear Option dedicated server build

Summary

This ports Nuclei to load on the current official Nuclear Option dedicated server build tested against:

• Nuclear Option dedicated server 0.33.3
• Linux/headless
• BepInEx 5.4.23.5
• Nuclei v1.3.3 / current master at 2159beb

The release DLL fails to chainload on this server, and current master needs API/namespace updates plus a different startup model because the official dedicated server now owns Steam server advertisement and mission rotation through DedicatedServerManager / DedicatedServerConfig.json.

What changed

• Add global usings for moved Nuclear Option namespaces:
  • NuclearOption.Chat
  • NuclearOption.Networking
  • NuclearOption.Networking.Lobbies
• Update the chat Harmony target to the current generated metadata name:
  • UserCode_CmdSendChatMessage_-456754112
• Update changed game APIs:
  • MissionManager.missionTime -> MissionManager.MissionTime
  • GameManager.LocalPlayer -> GameManager.GetLocalPlayer<Player>(out ...)
• Stop Nuclei from creating/managing its own Steam lobby/server on the official dedicated server path.
• Replace old lobby operations with no-op compatibility shims, because official dedicated server advertisement is already handled by the game.
• Make /stop quit the official dedicated server process cleanly.
• Disable /newmission for now on the official dedicated server path, with a private chat message explaining that mission loading is owned by the official dedicated server runner.
• Fix owner permissions so configured owner receives PermissionLevel.Owner, not PermissionLevel.Admin.

Why this shape

The official dedicated server appears to be the authoritative owner of:

• Steam game-server advertisement
• max player count / ports / password
• mission rotation
• map loading
• no-player stop behavior

So this patch makes Nuclei attach to the official server lifecycle instead of trying to launch a second legacy host/lobby path.

Verification

Build:

Nuclei -> bin/Release/net48/MaxWasUnavailable.Nuclei.dll
Build succeeded.
0 Error(s)

Runtime verification on both dedicated server instances:

[Info   :   BepInEx] Loading [MaxWasUnavailable.Nuclei 1.3.3]
[Info   :MaxWasUnavailable.Nuclei] Loading MaxWasUnavailable.Nuclei v1.3.3...
[Info   :MaxWasUnavailable.Nuclei] Plugin MaxWasUnavailable.Nuclei is loaded!

The tested server continued advertising and accepting the official dedicated server configuration through the base game server manager.

Known limitations

• /newmission is intentionally disabled in this patch because mission switching should be reimplemented against the official DedicatedServerManager rather than the removed legacy lobby/server path.
• This is a compatibility port for the official dedicated server path; it may need additional conditionals if Nuclei still wants to support older client-hosted server flows.