TASKS-1823 WebManager module

docs/architecture/react-frontend/layers/entities.md

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+# Entities
+
+Core domain models of the application — pure type definitions for business objects (`User`, `Product`, `Message`), their enums, and related constants. Stable, reusable, usable from any layer.
+
+```plaintext
+entities/
+| --- user.ts                 # { id: string; name: string; email: string }
+| --- product.ts              # { id: string; name: string; price: number }
+| --- enums.ts                # { UserRole, ProductCategory }
+```
+
+Larger entities can use a folder (`user/` with `interfaces.ts`, `enums.ts`, `rules.ts`, `index.ts`).
+
+```ts
+export type User = {
+  id: number;
+  name: string;
+  email: string;
+};
+
+export enum UserRole {
+  ADMIN = "admin",
+  SIMLPE_JACK = "simple_jack",
+}
+```