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/tailwind.config.ts

@@ -0,0 +1,26 @@
+import type { Config } from 'tailwindcss';
+
+const config: Config = {
+  content: [
+    './app/**/*.{js,ts,jsx,tsx,mdx}',
+    './components/**/*.{js,ts,jsx,tsx,mdx}',
+  ],
+  theme: {
+    extend: {
+      colors: {
+        primary: 'var(--color-primary)',
+        'primary-hover': 'var(--color-primary-hover)',
+        secondary: 'var(--color-secondary)',
+        background: 'var(--color-background)',
+        surface: 'var(--color-surface)',
+        text: 'var(--color-text)',
+        'text-muted': 'var(--color-text-muted)',
+        error: 'var(--color-error)',
+        success: 'var(--color-success)',
+        border: 'var(--color-border)',
+      },
+    },
+  },
+  plugins: [],
+};
+export default config;