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/app/(main)/trash/page.tsx

@@ -0,0 +1,21 @@
+import { getTrashedNotes } from '@/app/actions/notes'
+import { MasonryGrid } from '@/components/masonry-grid'
+import { TrashHeader } from '@/components/trash-header'
+import { TrashEmptyState } from './trash-empty-state'
+
+export const dynamic = 'force-dynamic'
+
+export default async function TrashPage() {
+  const notes = await getTrashedNotes()
+
+  return (
+    <main className="container mx-auto px-4 py-8 max-w-7xl">
+      <TrashHeader noteCount={notes.length} />
+      {notes.length > 0 ? (
+        <MasonryGrid notes={notes} isTrashView />
+      ) : (
+        <TrashEmptyState />
+      )}
+    </main>
+  )
+}

memento-note/app/(main)/trash/trash-empty-state.tsx

@@ -0,0 +1,20 @@
+'use client'
+
+import { Trash2 } from 'lucide-react'
+import { useLanguage } from '@/lib/i18n'
+
+export function TrashEmptyState() {
+  const { t } = useLanguage()
+
+  return (
+    <div className="flex flex-col items-center justify-center min-h-[60vh] text-center text-gray-500">
+      <div className="bg-gray-100 dark:bg-gray-800 p-6 rounded-full mb-4">
+        <Trash2 className="w-12 h-12 text-gray-400" />
+      </div>
+      <h2 className="text-xl font-medium mb-2">{t('trash.empty')}</h2>
+      <p className="max-w-md text-sm opacity-80">
+        {t('trash.emptyDescription')}
+      </p>
+    </div>
+  )
+}