refactor: migrate to monorepo structure with Docker, PocketBase, and e2e tests

- Reorganize into apps/, packages/, docs/, e2e/, pocketbase/ directories
- Add Dockerfiles for web, worker, and PocketBase services
- Add docker-compose.yml for local orchestration
- Add turbo.json for monorepo task management
- Add Playwright e2e test infrastructure
- Add PocketBase backend with migrations
- Remove Vite/Next.js/ESLint/PostCSS config files
- Update package.json with workspace dependencies
- Add .env.example and .dockerignore

apps/web/app/api/notes/graph/route.ts

@@ -0,0 +1,13 @@
+import { NextResponse } from 'next/server';
+import { withAuth } from '@/lib/auth';
+import { getNoteGraph } from '@/lib/services/note-service';
+
+// GET /api/notes/graph — Get note graph data for visualization
+export const GET = withAuth(async () => {
+  const graph = await getNoteGraph();
+  return NextResponse.json(graph, {
+    headers: {
+      'Cache-Control': 'private, max-age=60, stale-while-revalidate=300',
+    },
+  });
+});