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>

Makefile

@@ -0,0 +1,50 @@
+PORT ?= 5000
+IMAGE ?= mimic:latest
+CONTAINER ?= mimic
+VOLUME ?= mimic-data
+
+.PHONY: build start stop restart update logs create-admin update-mitre test-backend test-frontend test-e2e clean
+
+build:
+	docker build -f docker/Dockerfile -t $(IMAGE) .
+
+start:
+	docker run -d --name $(CONTAINER) -p $(PORT):5000 -v $(VOLUME):/data --env-file .env $(IMAGE)
+
+stop:
+	docker stop $(CONTAINER) && docker rm $(CONTAINER)
+
+restart:
+	$(MAKE) stop && $(MAKE) start
+
+update:
+	git pull && $(MAKE) build && $(MAKE) restart
+
+logs:
+	docker logs -f $(CONTAINER)
+
+create-admin:
+ifndef USER
+	$(error USER is required: make create-admin USER=alice PASS=p4ssw0rd)
+endif
+ifndef PASS
+	$(error PASS is required: make create-admin USER=alice PASS=p4ssw0rd)
+endif
+	docker exec $(CONTAINER) flask create-admin $(USER) $(PASS)
+
+update-mitre:
+	@echo "MITRE update: Sprint 2+"
+
+test-backend:
+	docker exec $(CONTAINER) pytest -q backend/tests/
+
+test-frontend:
+	cd frontend && npm run test -- --run
+
+test-e2e:
+	cd e2e && npx playwright test
+
+clean:
+	-docker rm -f $(CONTAINER) 2>/dev/null
+	-docker volume rm $(VOLUME) 2>/dev/null
+	rm -rf backend/__pycache__ frontend/node_modules frontend/dist