chore: clean up repo for public release

- Remove BMAD framework, IDE configs, dev screenshots, test files,
  internal docs, and backup files
- Rename keep-notes/ to memento-note/
- Update all references from keep-notes to memento-note
- Add Apache 2.0 license with Commons Clause (non-commercial restriction)
- Add clean .gitignore and .env.docker.example

memento-note/components/admin-sidebar.tsx

@@ -0,0 +1,77 @@
+'use client'
+
+import Link from 'next/link'
+import { usePathname } from 'next/navigation'
+import { LayoutDashboard, Users, Brain, Settings } from 'lucide-react'
+import { cn } from '@/lib/utils'
+import { useLanguage } from '@/lib/i18n'
+
+export interface AdminSidebarProps {
+  className?: string
+}
+
+export interface NavItem {
+  titleKey: string
+  href: string
+  icon: React.ReactNode
+}
+
+const navItems: NavItem[] = [
+  {
+    titleKey: 'admin.sidebar.dashboard',
+    href: '/admin',
+    icon: <LayoutDashboard className="h-5 w-5" />,
+  },
+  {
+    titleKey: 'admin.sidebar.users',
+    href: '/admin/users',
+    icon: <Users className="h-5 w-5" />,
+  },
+  {
+    titleKey: 'admin.sidebar.aiManagement',
+    href: '/admin/ai',
+    icon: <Brain className="h-5 w-5" />,
+  },
+  {
+    titleKey: 'admin.sidebar.settings',
+    href: '/admin/settings',
+    icon: <Settings className="h-5 w-5" />,
+  },
+]
+
+export function AdminSidebar({ className }: AdminSidebarProps) {
+  const pathname = usePathname()
+  const { t } = useLanguage()
+
+  return (
+    <aside
+      className={cn(
+        'w-64 bg-white dark:bg-zinc-900 border-r border-gray-200 dark:border-gray-800 p-4',
+        className
+      )}
+    >
+      <nav className="space-y-1">
+        {navItems.map((item) => {
+          const isActive = pathname === item.href || (item.href !== '/admin' && pathname?.startsWith(item.href))
+
+          return (
+            <Link
+              key={item.href}
+              href={item.href}
+              className={cn(
+                'flex items-center gap-3 px-4 py-3 rounded-lg text-sm font-medium transition-colors',
+                'hover:bg-gray-100 dark:hover:bg-zinc-800',
+                isActive
+                  ? 'bg-gray-100 dark:bg-zinc-800 text-gray-900 dark:text-white font-semibold'
+                  : 'text-gray-600 dark:text-gray-400'
+              )}
+            >
+              {item.icon}
+              <span>{t(item.titleKey)}</span>
+            </Link>
+          )
+        })}
+      </nav>
+    </aside>
+  )
+}