feat: add Satisfactory dedicated server

[n8flx]

✍️ Description

Adds a Community Scripts LXC installer for the Satisfactory Dedicated Server. It installs SteamCMD and App ID 1690800 on Debian 13, creates a systemd service, exposes journal and console logs, and provides an update flow with save-data backup and restore.

Satisfactory is proprietary Steam content. This submission asks whether a dedicated-server helper can receive an exception to the open-source and GitHub-based application requirements.

🔗 Related PR / Issue

Link: #1969 (automatically closed because the required template was missing)

✅ Prerequisites (X in brackets)

• Self-review completed – Code follows project standards.
• Tested thoroughly – The Community Scripts Default, Advanced and update flows still require end-to-end testing.
• No breaking changes – Existing functionality remains intact.
• No security risks – No hardcoded secrets or unnecessary privilege escalation.

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🏗️ arm64 Support (X in brackets)

• arm64 supported - Tested and supported on arm64.
• arm64 not tested - Assumed to work on arm64, but testing has not been done.
• arm64 not supported - Upstream server binaries target x86_64.

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🛠️ Type of Change (X in brackets)

• 🐞 Bug fix
• ✨ New feature
• 💥 Breaking change
• 🆕 New script
• 🌍 Website update
• 🔧 Refactoring / Code Cleanup
• 📝 Documentation update

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🔍 Code & Security Review (X in brackets)

• Follows CODE-AUDIT.md & CONTRIBUTING.md guidelines
• Uses correct script structure (AppName.sh, AppName-install.sh, AppName.json)
• No hardcoded credentials

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🤖 AI Assistance (X in brackets)

• No AI used
• AI was used – The scripts were built using AGENTS.md and .github/agents/pve-script-creator.agent.md as guidance, then reviewed and corrected against those guidelines.

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📋 Additional Information

Static validation completed: bash syntax checks pass, git diff --check passes, and ShellCheck 0.11.0 reports no error-severity findings. The underlying standalone SteamCMD installation has successfully created and started a Satisfactory server on Proxmox VE with Debian 13. The Community Scripts wrapper has not yet been tested end-to-end.

Default resources: 4 CPU, 8192 MiB RAM, 20 GiB disk. Required ports: 7777 TCP/UDP and 8888 TCP.

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📦 Application Requirements (for new scripts)

• The application is at least 6 months old
• The application is actively maintained
• The application has 600+ GitHub stars – Satisfactory is not developed on a public GitHub repository.
• Official release tarballs are published – The dedicated server is distributed through SteamCMD instead.
• I understand that not all scripts will be accepted due to various reasons and criteria by the community-scripts ORG

note from @asylumexp: it doesn't publish tarballs nor is it open source, but I reopened it anyways.

🌐 Source

• https://www.satisfactorygame.com/
• https://satisfactory.wiki.gg/wiki/Dedicated_servers
• SteamCMD App ID: 1690800