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/ui/toast.tsx

@@ -0,0 +1,28 @@
+'use client'
+
+import { Toaster as SonnerToaster, toast as sonnerToast } from 'sonner'
+
+// Re-export toast functions from Sonner
+export const toast = sonnerToast
+
+// Toaster component with custom styles
+export function Toaster() {
+  return (
+    <SonnerToaster
+      position="top-right"
+      expand={false}
+      richColors
+      closeButton
+      duration={3000}
+      className="toaster"
+      toastOptions={{
+        classNames: {
+          toast: 'toast pointer-events-auto',
+          description: 'toast-description',
+          actionButton: 'toast-action-button',
+          closeButton: 'toast-close-button',
+        },
+      }}
+    />
+  )
+}