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/src/styles/index.css

@@ -0,0 +1,94 @@
+@import './fonts.css';
+
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+@layer base {
+  html,
+  body,
+  #root {
+    height: 100%;
+  }
+
+  body {
+    @apply bg-canvas text-ink font-sans antialiased;
+    /* DESIGN.md: body line-height 1.4 when substituting Inter */
+    font-feature-settings: 'cv11', 'ss01';
+  }
+
+  /* Compensate for Inter being slightly narrower than Forma DJR Micro (~3%) */
+  :root {
+    font-size: 16.5px;
+  }
+
+  h1,
+  h2,
+  h3,
+  h4,
+  h5,
+  h6 {
+    line-height: 1;
+    font-weight: 500;
+  }
+}
+
+@layer components {
+  /*
+   * DESIGN.md component recipes.
+   * Buttons stay sharp (rounded-md = 4px); cards stay soft (rounded-xl = 16px).
+   */
+  .btn-primary {
+    @apply inline-flex items-center justify-center bg-primary text-ink-on uppercase tracking-[0.7px] font-semibold text-[14px] leading-[1.4] rounded-md px-xl py-sm h-11 transition-colors;
+  }
+  .btn-primary:hover {
+    @apply bg-primary-deep;
+  }
+  .btn-primary:disabled {
+    @apply bg-steel cursor-not-allowed;
+  }
+
+  .btn-ink {
+    @apply inline-flex items-center justify-center bg-ink text-ink-on uppercase tracking-[0.7px] font-semibold text-[14px] leading-[1.4] rounded-md px-xl py-sm h-11 transition-colors;
+  }
+  .btn-ink:hover {
+    @apply bg-ink-soft;
+  }
+  .btn-ink:disabled {
+    @apply bg-steel cursor-not-allowed;
+  }
+
+  .btn-outline {
+    @apply inline-flex items-center justify-center bg-canvas text-primary border border-primary uppercase tracking-[0.7px] font-semibold text-[14px] leading-[1.4] rounded-md px-xl py-sm h-11 transition-colors;
+  }
+  .btn-outline:hover {
+    @apply bg-primary-soft;
+  }
+
+  .btn-outline-ink {
+    @apply inline-flex items-center justify-center bg-canvas text-ink border border-ink uppercase tracking-[0.7px] font-semibold text-[14px] leading-[1.4] rounded-md px-xl py-sm h-11 transition-colors;
+  }
+  .btn-outline-ink:hover {
+    @apply bg-cloud;
+  }
+
+  .btn-text-link {
+    @apply inline-flex items-center text-primary font-medium text-[16px] leading-[1.38] underline-offset-2 hover:underline;
+  }
+
+  .text-input {
+    @apply block w-full bg-canvas text-ink rounded-md border border-steel px-md py-sm h-11 text-[16px] leading-[1.38] focus:outline-none focus:border-ink;
+  }
+
+  .card-product {
+    @apply bg-canvas rounded-xl p-xl shadow-soft-lift;
+  }
+
+  .badge-pill-ink {
+    @apply inline-flex items-center bg-ink text-ink-on rounded-lg px-3 py-[6px] text-[14px] leading-[1.3] font-medium;
+  }
+
+  .badge-pill-outline {
+    @apply inline-flex items-center bg-canvas text-ink border border-ink rounded-lg px-3 py-[6px] text-[14px] leading-[1.3] font-medium;
+  }
+}