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/apps/cli/src/components/shared/FormInput.tsx

@@ -0,0 +1,34 @@
+import React from 'react';
+import { Box, Text } from 'ink';
+import TextInput from 'ink-text-input';
+
+interface FormInputProps {
+  label: string;
+  value: string;
+  onChange: (value: string) => void;
+  onSubmit?: (value: string) => void;
+  focus: boolean;
+  placeholder?: string;
+  mask?: string;
+  error?: string;
+}
+
+export function FormInput({ label, value, onChange, onSubmit, focus, placeholder, mask, error }: FormInputProps) {
+  return (
+    <Box flexDirection="column">
+      <Text color={focus ? 'cyan' : 'gray'}>{label}</Text>
+      <Box>
+        <Text color="gray"> › </Text>
+        <TextInput
+          value={value}
+          onChange={onChange}
+          {...(onSubmit !== undefined ? { onSubmit } : {})}
+          focus={focus}
+          {...(placeholder !== undefined ? { placeholder } : {})}
+          {...(mask !== undefined ? { mask } : {})}
+        />
+      </Box>
+      {error !== undefined && <Text color="red">⚠ {error}</Text>}
+    </Box>
+  );
+}