Demo business removal

Removed the demo business as its easier to just provision one manually.

manager/src/lib/compose-template.ts

@@ -1,15 +1,16 @@
 /**
- * Generates the exact same shape as stacks/demo-business/compose.yaml
- * and stacks/marios/compose.yaml (the two hand-written example stacks) —
- * keep these in sync if that shape changes.
+ * The canonical definition of a business stack's compose.yaml shape —
+ * there's no separate hand-written example kept in the repo to stay in
+ * sync with; this generator is the single source of truth. See
+ * stacks/infra/compose.yaml's own header for the by-hand equivalent
+ * steps (creating the database, .env, Caddy site) this replaces.
  */
 export function generateComposeYaml(slug: string): string {
   const containerName = `next-chair-${slug}`;
   const volumeName = `next-chair-media-${slug}`;
   return `name: ${containerName}
 
-# Generated by the management UI — see stacks/demo-business/compose.yaml
-# for the hand-written original this mirrors.
+# Generated by the management UI.
 
 services:
   ${containerName}: