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/(auth)/register/page.tsx

@@ -0,0 +1,20 @@
+import { RegisterForm } from '@/components/register-form';
+import { getSystemConfig } from '@/lib/config';
+import { redirect } from 'next/navigation';
+ 
+export default async function RegisterPage() {
+  const config = await getSystemConfig();
+  const allowRegister = config.ALLOW_REGISTRATION !== 'false' && process.env.ALLOW_REGISTRATION !== 'false';
+
+  if (!allowRegister) {
+    redirect('/login');
+  }
+
+  return (
+    <main className="flex items-center justify-center md:h-screen">
+      <div className="relative mx-auto flex w-full max-w-[400px] flex-col space-y-2.5 p-4 md:-mt-32">
+        <RegisterForm />
+      </div>
+    </main>
+  );
+}