feat: sprint 1 — auth + CRUD engagements

Ship the first feature end-to-end on the UI: users log in with JWT,
admins manage user accounts, and any authenticated user (per RBAC)
can create, list, view, edit, and delete engagements.

Backend (Flask + SQLAlchemy + SQLite, 63 pytest)
- User / Engagement models, Alembic 0001 initial schema
- argon2 password hashing, JWT bearer (60-min TTL), @login_required
  and @role_required decorators
- 13 API endpoints under /api/*, including last-admin protection on
  DELETE/PATCH user and JSON 404 on unknown /api/* paths
- `flask create-admin` CLI with duplicate / short-password handling

Frontend (React + Vite + Tailwind + TanStack Query, 20 vitest)
- Inter font bundled locally (no CDN), DESIGN.md tokens in Tailwind
- LoginPage / EngagementsList / EngagementForm / EngagementDetail /
  UsersAdmin pages with role-aware UI
- Layout, ProtectedRoute, StatusBadge, FormField, LoadingState,
  ErrorState, EmptyState, Toast + provider
- Axios client: Bearer interceptor, 401 → purge + /login + "Session
  expirée" toast, 403 → "Accès refusé" toast (declarative <Navigate>
  for already-authed users, Fragment-keyed admin user rows)

Deployment
- Single multistage Dockerfile (node:20-alpine → python:3.12-slim)
- docker/entrypoint.sh runs `flask db upgrade` before `flask run`
- Makefile: build/start/stop/restart/update/logs/create-admin/
  update-mitre/test-{backend,frontend,e2e}/clean
- .env.example documenting MIMIC_JWT_SECRET / MIMIC_DB_PATH / MIMIC_PORT
- SQLite at /data/mimic.sqlite on named volume mimic-data

Acceptance suite (Playwright, 36 tests, all 27 ACs)
- e2e/ scaffold with playwright.config + auth/api fixtures
- One spec per user story (us1-bootstrap through us6-deployment)
- Portable via MIMIC_CONTAINER_CMD / MIMIC_BASE_URL (docker or podman)

Docs
- README.md with quick-start and architecture overview
- CHANGELOG.md updated with Sprint 1 deliverables
- pyrightconfig.json so the Python LSP sees backend/.venv and
  resolves the `backend.app.*` absolute imports

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/tests/utils.tsx

@@ -0,0 +1,33 @@
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
+import { render, type RenderOptions } from '@testing-library/react';
+import { MemoryRouter, type MemoryRouterProps } from 'react-router-dom';
+import type { ReactElement, ReactNode } from 'react';
+import { ToastProvider } from '@/hooks/useToast';
+
+interface WrapperOptions {
+  routerProps?: MemoryRouterProps;
+}
+
+export function makeQueryClient(): QueryClient {
+  return new QueryClient({
+    defaultOptions: {
+      queries: { retry: false, gcTime: 0, staleTime: 0 },
+      mutations: { retry: false },
+    },
+  });
+}
+
+export function renderWithProviders(
+  ui: ReactElement,
+  { routerProps, ...rtlOptions }: WrapperOptions & Omit<RenderOptions, 'wrapper'> = {},
+) {
+  const client = makeQueryClient();
+  const Wrapper = ({ children }: { children: ReactNode }) => (
+    <QueryClientProvider client={client}>
+      <MemoryRouter {...routerProps}>
+        <ToastProvider>{children}</ToastProvider>
+      </MemoryRouter>
+    </QueryClientProvider>
+  );
+  return { ...render(ui, { wrapper: Wrapper, ...rtlOptions }), client };
+}