Implement SimpleNote Web API - full REST API with Express

- Express server with CORS, JSON middleware
- Auth middleware (Bearer token)
- Document CRUD with markdown storage
- Library CRUD with nested support
- Tag indexing and search
- Error handler middleware
- Config from env vars
- Init script for data structure

src/utils/uuid.js

@@ -0,0 +1,11 @@
+/**
+ * SimpleNote Web - UUID Helper
+ */
+
+import { v4 as uuidv4 } from 'uuid';
+
+export function generateId() {
+  return uuidv4();
+}
+
+export default { generateId };