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>

backend/tests/conftest.py

@@ -0,0 +1,92 @@
+"""Shared pytest fixtures."""
+from __future__ import annotations
+
+from collections.abc import Generator
+
+import pytest
+from flask import Flask
+from flask.testing import FlaskClient
+
+from backend.app import create_app
+from backend.app.auth import hash_password
+from backend.app.config import TestConfig
+from backend.app.extensions import db
+from backend.app.models import User, UserRole
+
+
+@pytest.fixture()
+def app() -> Generator[Flask, None, None]:
+    application = create_app(TestConfig())
+    with application.app_context():
+        db.create_all()
+        yield application
+        db.session.remove()
+        db.drop_all()
+
+
+@pytest.fixture()
+def client(app: Flask) -> FlaskClient:
+    return app.test_client()
+
+
+@pytest.fixture()
+def admin_user(app: Flask) -> User:
+    user = User(
+        username="admin1",
+        password_hash=hash_password("adminpass1"),
+        role=UserRole.ADMIN,
+    )
+    db.session.add(user)
+    db.session.commit()
+    return user
+
+
+@pytest.fixture()
+def redteam_user(app: Flask) -> User:
+    user = User(
+        username="redteam1",
+        password_hash=hash_password("redteampass1"),
+        role=UserRole.REDTEAM,
+    )
+    db.session.add(user)
+    db.session.commit()
+    return user
+
+
+@pytest.fixture()
+def soc_user(app: Flask) -> User:
+    user = User(
+        username="soc1",
+        password_hash=hash_password("socpass1"),
+        role=UserRole.SOC,
+    )
+    db.session.add(user)
+    db.session.commit()
+    return user
+
+
+def _login(client: FlaskClient, username: str, password: str) -> str:
+    resp = client.post(
+        "/api/auth/login", json={"username": username, "password": password}
+    )
+    assert resp.status_code == 200, resp.get_json()
+    return resp.get_json()["access_token"]
+
+
+@pytest.fixture()
+def admin_token(client: FlaskClient, admin_user: User) -> str:
+    return _login(client, "admin1", "adminpass1")
+
+
+@pytest.fixture()
+def redteam_token(client: FlaskClient, redteam_user: User) -> str:
+    return _login(client, "redteam1", "redteampass1")
+
+
+@pytest.fixture()
+def soc_token(client: FlaskClient, soc_user: User) -> str:
+    return _login(client, "soc1", "socpass1")
+
+
+def auth_headers(token: str) -> dict[str, str]:
+    return {"Authorization": f"Bearer {token}"}