feat(frontend): TypeScript-Monorepo mit Terminal-UI für Effigenix ERP

Monorepo-Setup (pnpm workspaces) mit vier shared Packages und einer TUI-App:

Shared Packages:
- @effigenix/types: TypeScript-DTOs (UserDTO, RoleDTO, AuthDTO, Enums)
- @effigenix/config: API-Konfiguration und Shared Constants
- @effigenix/validation: Zod-Schemas für Username, E-Mail und Passwort
- @effigenix/api-client: axios-Client mit JWT-Handling (proaktiver + reaktiver
  Token-Refresh), AuthInterceptor, ErrorInterceptor, Resources für auth/users/roles

TUI (apps/cli, Ink 5 / React):
- Authentication: Login/Logout, Session-Restore beim Start, JWT-Refresh
- User Management: Liste, Anlage (Zod-Inline-Validation), Detailansicht,
  Passwort ändern, Sperren/Entsperren mit ConfirmDialog
- Role Management: Liste, Detailansicht, Zuweisen/Entfernen per RoleSelectList (↑↓)
- UX: SuccessDisplay (Auto-Dismiss 3 s), ConfirmDialog (J/N),
  FormInput mit Inline-Fehlern, StatusBar mit API-URL
- Layout: Fullscreen-Modus (alternate screen buffer), Header mit eingeloggtem User
- Tests: vitest + ink-testing-library (15 Tests)

frontend/packages/api-client/src/resources/roles.ts

@@ -0,0 +1,23 @@
+/**
+ * Roles resource: list all roles
+ */
+
+import type { AxiosInstance } from 'axios';
+import { API_PATHS } from '@effigenix/config';
+
+export interface RoleDTO {
+  id: string;
+  name: string;
+  permissions: string[];
+}
+
+export function createRolesResource(client: AxiosInstance) {
+  return {
+    async list(): Promise<RoleDTO[]> {
+      const response = await client.get<RoleDTO[]>(API_PATHS.roles.base);
+      return response.data;
+    },
+  };
+}
+
+export type RolesResource = ReturnType<typeof createRolesResource>;