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/middleware.ts

@@ -0,0 +1,9 @@
+import NextAuth from 'next-auth';
+import { authConfig } from './auth.config';
+
+export default NextAuth(authConfig).auth;
+
+export const config = {
+  // https://nextjs.org/docs/app/building-your-application/routing/middleware#matcher
+  matcher: ['/((?!api|_next/static|_next/image|.*\.png$).*)'],
+};