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/components/ui/Table.tsx

@@ -0,0 +1,43 @@
+import { ReactNode } from 'react';
+
+interface TableProps<T> {
+  columns: { key: string; label: string; render?: (row: T) => ReactNode }[];
+  data: T[];
+  rowKey: (row: T) => string;
+}
+
+export function Table<T extends Record<string, any>>({ columns, data, rowKey }: TableProps<T>) {
+  return (
+    <div className="overflow-x-auto">
+      <table className="w-full border-collapse">
+        <thead>
+          <tr className="border-b border-border">
+            {columns.map((col) => (
+              <th key={col.key} className="text-left py-3 px-4 font-medium text-text-muted text-sm">
+                {col.label}
+              </th>
+            ))}
+          </tr>
+        </thead>
+        <tbody>
+          {data.map((row) => (
+            <tr key={rowKey(row)} className="border-b border-border hover:bg-background/50">
+              {columns.map((col) => (
+                <td key={col.key} className="py-3 px-4 text-text">
+                  {col.render ? col.render(row) : String(row[col.key] ?? '')}
+                </td>
+              ))}
+            </tr>
+          ))}
+          {data.length === 0 && (
+            <tr>
+              <td colSpan={columns.length} className="py-8 text-center text-text-muted">
+                No data available
+              </td>
+            </tr>
+          )}
+        </tbody>
+      </table>
+    </div>
+  );
+}