split hosts

hosts/README.md

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+# Host Configurations
+
+This directory contains NixOS configurations for multiple machines.
+
+## Structure
+
+```
+hosts/
+├── atlas/                    # Desktop gaming machine
+│   ├── configuration.nix     # Main config (core + hardware + desktop + dev + gaming + services)
+│   └── hardware-configuration.nix  # Hardware-specific settings
+├── laptop/                   # Laptop with desktop environment
+│   ├── configuration.nix     # Main config (core + hardware + desktop + dev + services)
+│   └── hardware-configuration.nix  # Placeholder - generate on actual machine
+└── server/                   # Headless server
+    ├── configuration.nix     # Main config (core + hardware[no GPU] + dev + maintenance)
+    └── hardware-configuration.nix  # Placeholder - generate on actual machine
+```
+
+## Module Assignments
+
+### All Hosts
+- **Core**: boot, networking, users, system, localization
+- **Development**: tools, docker, shell
+
+### Atlas & Laptop Only
+- **Hardware**: GPU, audio, storage, power
+- **Desktop**: window manager, apps, theming, portals
+- **Services**: printing, avahi, maintenance (navidrome only on atlas)
+
+### Atlas Only
+- **Gaming**: steam, gamemode, wine
+
+### Server Only
+- Headless - no desktop or gaming
+- SSH enabled for remote management
+
+## Usage
+
+### Build a specific host
+
+```bash
+# Build atlas (current desktop)
+nixos-rebuild switch --flake .#atlas
+
+# Build server (once hardware-config is ready)
+nixos-rebuild switch --flake .#server
+
+# Build laptop (once hardware-config is ready)
+nixos-rebuild switch --flake .#laptop
+```
+
+### Setting up a new machine
+
+1. Install NixOS on the target machine
+2. Generate hardware config:
+   ```bash
+   sudo nixos-generate-config --show-hardware-config > hardware-configuration.nix
+   ```
+3. Copy that file to `hosts/<hostname>/hardware-configuration.nix` in this repo
+4. Adjust `hosts/<hostname>/configuration.nix` as needed
+5. Build and switch:
+   ```bash
+   nixos-rebuild switch --flake .#<hostname>
+   ```
+
+## Adding a new host
+
+1. Create `hosts/<hostname>/` directory
+2. Copy `configuration.nix` from similar host as template
+3. Generate `hardware-configuration.nix` on target machine
+4. Add to `flake.nix`:
+   ```nix
+   nixosConfigurations.<hostname> = mkHost "<hostname>";
+   ```