tidy up project structure

app

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+frontends/nextjs

docs/FRONTEND_ORGANIZATION_COMPLETE.md

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+# ✅ Frontend Organization Complete
+
+The Next.js frontend has been reorganized into a dedicated `frontends` folder structure.
+
+## What Changed
+
+### Directory Move
+- **Before:** `/app/` (Next.js app directory at root)
+- **After:** `/frontends/nextjs/` (organized in frontends folder)
+
+### Symlink Created
+```
+/app → /frontends/nextjs (symbolic link)
+```
+
+## How It Works
+
+The symlink allows:
+1. **Next.js compatibility** - Finds `/app` at expected root location
+2. **Better organization** - Actual source files in `/frontends/nextjs`
+3. **Future scalability** - Supports multiple frontends (svelte, vue, mobile, etc.)
+
+## Verification
+
+```bash
+# Check the symlink
+ls -l app
+# Output: app -> frontends/nextjs ✓
+
+# Check frontend files
+ls frontends/nextjs/layout.tsx
+# Output: frontends/nextjs/layout.tsx ✓
+
+# Build still works
+npm run build
+# ✓ Builds successfully via symlink
+```
+
+## Files Inside
+
+```
+frontends/nextjs/
+├── _components/
+│   └── auth-provider.tsx
+├── api/
+│   └── users/route.ts
+├── layout.tsx
+├── level1-client.tsx
+├── page.tsx
+└── providers.tsx
+```
+
+## Development Commands (Unchanged)
+
+```bash
+npm run dev       # Works via symlink
+npm run build     # Works via symlink
+npm run test      # Unchanged
+npm run lint      # Unchanged
+```
+
+## Future
+
+This structure supports adding more frontends:
+
+```
+frontends/
+├── nextjs/       # React + Next.js (current)
+├── svelte/       # Svelte version (future)
+├── vue/          # Vue version (future)
+└── mobile/       # React Native (future)
+```
+
+---
+
+**Date:** December 25, 2025  
+**Status:** ✅ Complete  
+
+See [FOLDER_ORGANIZATION_SUMMARY.md](FOLDER_ORGANIZATION_SUMMARY.md) for complete root organization details.