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/lib/notebook-icon.tsx

@@ -0,0 +1,36 @@
+import {
+  Folder,
+  Briefcase,
+  FileText,
+  Zap,
+  BarChart3,
+  Globe,
+  Sparkles,
+  Book,
+  Heart,
+  Crown,
+  Music,
+  Building2,
+  Plane,
+  type LucideIcon,
+} from 'lucide-react'
+
+const ICON_MAP: Record<string, LucideIcon> = {
+  'folder': Folder,
+  'briefcase': Briefcase,
+  'document': FileText,
+  'lightning': Zap,
+  'chart': BarChart3,
+  'globe': Globe,
+  'sparkle': Sparkles,
+  'book': Book,
+  'heart': Heart,
+  'crown': Crown,
+  'music': Music,
+  'building': Building2,
+  'flight_takeoff': Plane,
+}
+
+export function getNotebookIcon(iconName: string | null | undefined): LucideIcon {
+  return ICON_MAP[iconName || 'folder'] || Folder
+}