Subnautica Nitrox: Update to Nitrox 1.8.x

[norto22]

Description

Updates the Subnautica Nitrox egg for Nitrox 1.8.x compatibility. Resolves three open issues and supersedes one open PR.

Closes #319
Closes #461
Closes #551

Supersedes #445 (binary rename only — covered here as part of a broader fix).

Issue breakdown:

• [Subnautica] Issue #551 — server start command, classdata.tpk path, port not applied
• [Subnautica] Issue #461 — server fails to start on current Nitrox
• [Bug]: Subnautica - Server.cfg not respected or used , also console not interactive ? #319 — server.cfg not respected, console not interactive (graceful stop fixed; in-game console interactivity documented as known upstream Nitrox limitation)

What changed

Startup

• New binary name: Nitrox.Server.Subnautica (was NitroxServer-Subnautica).
• Game install located via SUBNAUTICA_INSTALLATION_PATH env var; --data-path and --save passed explicitly. --game-path is not used because Nitrox 1.8.x's ConfigurationKeyName-based CLI binding doesn't honor it via Configuration.Bind.
• Stop command changed from stop to ^C. Nitrox 1.8.x's ConsoleInputService does not process Pterodactyl's TTY stdin, so the string stop was silently dropped; SIGINT is caught by .NET Generic Host for a clean save + shutdown.

Install script

• Removed the legacy FIRST_DIR flattening block — it destroyed the Resources/ directory in Nitrox 1.8.x's flat-zip layout (root cause of classdata.tpk missing reports in [Subnautica] Issue #551).
• Seeds a real NitroxData/saves/nitrox_world/server.cfg so the Pterodactyl config parser has a file to update on every start.
• Cleaned up duplicate/dead branches in the old script; replaced the heredoc with a { echo; …; } > file block to avoid textarea-mangled EOT terminators.

Config & variables

• config.files path corrected to NitroxData/saves/nitrox_world/server.cfg (the file Nitrox actually reads in 1.8.x).
• Added MAX_CONNECTIONS, DEFAULT_PERMISSION, DISABLE_CONSOLE panel-managed keys.
• Removed SUBNAUTICA_INSTALLATION_PATH and XDG_CONFIG_HOME variables (paths now handled in the startup command directly).
• SAVE_NAME locked to nitrox_world (User Editable off) because wings does not template variables inside config.files keys, letting users change it would silently break panel-managed config.

Docs

• Per-egg README rewritten following the conventional format (Requirements / Steam Guard flow / Ports / Save folder / Configuration / Known limitations / Updating).
• Added Subnautica to the root README index (was missing).

Testing

• ✅ Fresh install completes; SteamCMD downloads to /home/container/subnautica/; Nitrox extracts with Resources/classdata.tpk intact.
• ✅ Server reaches "Server started" within seconds.
• ✅ Listens on the panel-allocated UDP port (parser-driven, not hardcoded 11000).
• ✅ Joined with the Nitrox launcher, played for ~5 minutes — no lag, no errors.
• ✅ Panel Stop triggers clean shutdown via SIGINT (no 30s kill-timeout wait).

Known limitation (documented in per-egg README)

Nitrox 1.8.x's ConsoleInputService early-exits when Console.IsInputRedirected is true, and otherwise uses Console.KeyAvailable/Console.ReadKey which requires raw-mode TTY behavior Pterodactyl Wings doesn't currently provide. Net effect: in-game console commands typed into the panel web console don't reach Nitrox. The server itself runs fine and admin commands work in-game. A yolks-level wrapper has been discussed in #319; until that lands, this is upstream Nitrox.

Checklist for all submissions

• Have you followed the guidelines in our Contributing document?

• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

• Have you tested and reviewed your changes with confidence that everything works?

• Did you branch your changes and PR from that branch and not from your master branch?

• You verify that the start command applied does not use a shell script

• The egg was exported from the panel