Add Inventory and Host Generation

Inventory-and-Host-Generation.md

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+# Inventory & Host Generation
+
+All hosts are defined in `inventory.nix`.
+
+Top-level keys are hostname prefixes.
+Actual hostnames are generated from device definitions.
+
+## Example
+
+```nix
+nix-laptop = {
+  devices = 3;
+};
+```
+
+Produces:
+
+- nix-laptop1
+- nix-laptop2
+- nix-laptop3
+
+## Hostname Rules
+
+- Numeric suffix → no dash
+- String suffix → dash added
+- Disable prefix:
+
+```nix
+athenix.host.useHostPrefix = false;
+```
+
+## Overrides
+
+Apply configuration to all devices:
+
+```nix
+overrides = {
+  athenix.users.student.enable = true;
+};
+```
+
+## Per-Device Configuration
+
+```nix
+devices = {
+  "1".athenix.sw.kioskUrl = "https://dash1";
+  "admin".athenix.sw.type = "desktop";
+};
+```