chore(oss): audit the console package and the Helm chart

Add the dist/migrate.js entrypoint the Helm job already invoked and point
Compose at the same runner, so one implementation applies
packages/server/migrations in both paths. Rewrite the console README to
the standalone Docker build it actually uses and fix the chart
description.

Claude-Session: https://claude.ai/code/session_01Agoc9bRVE9KL7mmWtey9Vq

packages/console/src/components/ui/Sidebar.tsx

@@ -135,7 +135,7 @@ export default function Sidebar({ isOpen, onClose }: SidebarProps) {
 
   return (
     <>
-      {/* Backdrop overlay — mobile only */}
+      {/* Mobile backdrop overlay */}
       {isOpen && (
         <div
           className="fixed inset-0 bg-black/50 z-40 md:hidden"