Add host modules and home options; update README

hosts/Garand-Desktop/system-modules.nix

@@ -0,0 +1,87 @@
+_: {
+  /*
+  Container & Packaging
+  */
+  # Docker: container runtime and management
+  docker.enable = true;
+  # Distrobox: containerized development environments
+  distrobox.enable = false;
+  # Flatpak: universal packaging system for Linux
+  flatpak.enable = true;
+  # Lazydocker: simple TUI for Docker
+  lazydocker.enable = false;
+
+  /*
+  Gaming
+  */
+  # GameMode: optimizes system performance for gaming
+  gamemode.enable = true;
+  # Gamescope: micro-compositor for games
+  gamescope.enable = false;
+  # Prism Launcher: Minecraft modded launcher
+  prismlauncher.enable = false;
+  # Steam: platform for buying and playing games
+  steam.enable = true;
+  # SpaceCadet Pinball: classic pinball game
+  spaceCadetPinball.enable = true;
+  # TTY Solitaire: terminal based solitaire game
+  ttySolitaire.enable = true;
+
+  /*
+  Development Tools
+  */
+  # Exercism: coding practice platform
+  exercism.enable = true;
+  # Gedit: GNOME text editor
+  gedit.enable = false;
+  # Lazygit: simple TUI for git
+  lazygit.enable = false;
+  # OpenCode: tools for coding and development
+  opencode.enable = true;
+
+  /*
+  Communication & Collaboration
+  */
+  # Mattermost: open-source Slack alternative
+  mattermost.enable = true;
+  # Slack: team communication and collaboration tool
+  slack.enable = true;
+  # Tutanota: secure email client
+  tutanota.enable = true;
+
+  /*
+  Productivity / Knowledge Management
+  */
+  # Bitwarden: password manager (desktop)
+  bitwarden.enable = false;
+  # Iotas: lightweight notes manager
+  iotas.enable = true;
+  # Logseq: knowledge base and outliner
+  logseq.enable = false;
+
+  /*
+  Media & Graphics
+  */
+  # Affinity: professional graphics suite
+  affinity.enable = false;
+  # Eye of GNOME: image viewer
+  eyeOfGnome.enable = true;
+  # FreeTube: privacy‑friendly YouTube client
+  freetube.enable = false;
+  # GIMP: gnu image manipulation program
+  gimp.enable = false;
+  # Kdenlive: video editing software
+  kdenlive.enable = false;
+  # Plex: media player and server client
+  plex.enable = true;
+
+  /*
+  Utilities / Misc
+  */
+  # Eddie AirVPN: VPN client
+  eddieAirVPN.enable = true;
+  # Galculator: simple calculator
+  galculator.enable = true;
+  # Winboat: Windows remote desktop via RDP
+  winboat.enable = false;
+}