feat(T01): auth + user management + RBAC + base frontend + i18n

- Backend: FastAPI, JWT auth (HS256), bcrypt, RBAC middleware
- User CRUD (admin-only), soft-delete, pagination
- Pydantic BaseSettings config, async SQLAlchemy 2.0
- 50 backend tests, 88% coverage
- Frontend: Next.js 14 App Router, Tailwind, design tokens
- Login page, auth context, API client with auto-refresh
- i18n: next-intl, DE/EN (31 keys each)
- 6 base UI components (Button, Input, Card, Table, Modal, Toast)
- 12 frontend tests, npm build success

frontend/package.json

@@ -0,0 +1,33 @@
+{
+  "name": "erp-nutzfahrzeuge-frontend",
+  "version": "1.0.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start",
+    "lint": "next lint",
+    "test": "vitest run",
+    "test:coverage": "vitest run --coverage"
+  },
+  "dependencies": {
+    "next": "14.2.5",
+    "react": "18.3.1",
+    "react-dom": "18.3.1",
+    "next-intl": "3.17.0"
+  },
+  "devDependencies": {
+    "typescript": "5.5.4",
+    "@types/node": "20.14.0",
+    "@types/react": "18.3.3",
+    "@types/react-dom": "18.3.0",
+    "tailwindcss": "3.4.7",
+    "postcss": "8.4.40",
+    "autoprefixer": "10.4.19",
+    "vitest": "2.0.5",
+    "@testing-library/react": "16.0.1",
+    "@testing-library/jest-dom": "6.4.8",
+    "jsdom": "24.1.1",
+    "@vitejs/plugin-react": "4.3.1"
+  }
+}