offscale, extracted from the platform into its own repository

The tailnet plugin — machines, users, pre-auth keys, access policy and device
invites. Moved out of officerdev/platform, where it had lived in plugins/ since
the plugin system was built.

Until now this code existed in exactly one place: the platform repository. That
made "gitignore the plugins directory" impossible to do safely, because
untracking it would have left 49 files on a single disk with no remote. This
repository is what makes that move safe.

Same extraction as plugins/music before it: source only, no history. The
platform's history still holds every commit that shaped this, and the SHAs cited
across the codebase keep resolving — replaying it here would have created a
second, divergent account of the same work.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

web/layout.ts

@@ -0,0 +1,22 @@
+import type { LayoutNode } from 'officerdev';
+
+export const defaultLayout: LayoutNode = {
+  type: 'group',
+  id: 'offscale-root',
+  direction: 'horizontal',
+  children: [
+    {
+      node: {
+        type: 'group',
+        id: 'headscale-sidebar',
+        direction: 'vertical',
+        children: [
+          { node: { type: 'panel', id: 'headscale-servers', appType: 'headscale-servers' }, size: 30 },
+          { node: { type: 'panel', id: 'headscale-nav', appType: 'headscale-nav' }, size: 70 },
+        ],
+      },
+      size: 22,
+    },
+    { node: { type: 'panel', id: 'headscale-view', appType: 'headscale-view' }, size: 78 },
+  ],
+};