api/disk-templates: adopt directory structure from clan modules

templates/disk/single-disk/README.md

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+---
+description = "Simple single disk schema"
+---
+# Description
+
+This schema defines a GPT-based disk layout.
+
+### **Disk Overview**
+
+- **Name**: `main-{{uuid}}`
+- **Device**: `{{mainDisk}}`
+
+### **Partitions**
+
+1. **EFI System Partition (ESP)**
+   - Size: `500M`.
+   - Filesystem: `vfat`.
+   - Mount Point: `/boot` (secure `umask=0077`).
+
+2. **Root Partition**
+   - Size: Remaining disk space (`100%`).
+   - Filesystem: `ext4`.
+   - Mount Point: `/`.

templates/disk/single-disk/default.nix

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+{
+  disko.devices = {
+    disk = {
+      main = {
+        name = "main-{{uuid}}";
+        device = "{{mainDisk}}";
+        type = "disk";
+        content = {
+          type = "gpt";
+          partitions = {
+            ESP = {
+              type = "EF00";
+              size = "500M";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+                mountOptions = [ "umask=0077" ];
+              };
+            };
+            root = {
+              size = "100%";
+              content = {
+                type = "filesystem";
+                format = "ext4";
+                mountpoint = "/";
+              };
+            };
+          };
+        };
+      };
+    };
+  };
+}