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/test_users.py

@@ -0,0 +1,201 @@
+"""User management endpoint tests."""
+from __future__ import annotations
+
+from flask.testing import FlaskClient
+
+from backend.app.auth import hash_password
+from backend.app.extensions import db
+from backend.app.models import User, UserRole
+from backend.tests.conftest import auth_headers as _h
+
+
+def test_list_users_admin_only(
+    client: FlaskClient, admin_user: User, admin_token: str
+) -> None:
+    resp = client.get("/api/users", headers=_h(admin_token))
+    assert resp.status_code == 200
+    body = resp.get_json()
+    assert isinstance(body, list)
+    assert any(u["username"] == "admin1" for u in body)
+    assert all("password_hash" not in u for u in body)
+
+
+def test_list_users_forbidden_for_redteam(
+    client: FlaskClient, redteam_token: str
+) -> None:
+    resp = client.get("/api/users", headers=_h(redteam_token))
+    assert resp.status_code == 403
+
+
+def test_list_users_forbidden_for_soc(client: FlaskClient, soc_token: str) -> None:
+    resp = client.get("/api/users", headers=_h(soc_token))
+    assert resp.status_code == 403
+
+
+def test_list_users_unauth(client: FlaskClient) -> None:
+    resp = client.get("/api/users")
+    assert resp.status_code == 401
+
+
+def test_create_user_success(client: FlaskClient, admin_token: str) -> None:
+    resp = client.post(
+        "/api/users",
+        headers=_h(admin_token),
+        json={"username": "newbie", "password": "longenough1", "role": "redteam"},
+    )
+    assert resp.status_code == 201
+    body = resp.get_json()
+    assert body["username"] == "newbie"
+    assert body["role"] == "redteam"
+    assert "password_hash" not in body
+
+
+def test_create_user_duplicate_username(
+    client: FlaskClient, admin_user: User, admin_token: str
+) -> None:
+    resp = client.post(
+        "/api/users",
+        headers=_h(admin_token),
+        json={"username": "admin1", "password": "longenough1", "role": "redteam"},
+    )
+    assert resp.status_code == 400
+    assert "exists" in resp.get_json()["error"]
+
+
+def test_create_user_short_password(client: FlaskClient, admin_token: str) -> None:
+    resp = client.post(
+        "/api/users",
+        headers=_h(admin_token),
+        json={"username": "short", "password": "abc", "role": "soc"},
+    )
+    assert resp.status_code == 400
+    assert "8 characters" in resp.get_json()["error"]
+
+
+def test_create_user_invalid_role(client: FlaskClient, admin_token: str) -> None:
+    resp = client.post(
+        "/api/users",
+        headers=_h(admin_token),
+        json={"username": "x", "password": "longenough1", "role": "godmode"},
+    )
+    assert resp.status_code == 400
+
+
+def test_create_user_forbidden_for_non_admin(
+    client: FlaskClient, redteam_token: str
+) -> None:
+    resp = client.post(
+        "/api/users",
+        headers=_h(redteam_token),
+        json={"username": "x", "password": "longenough1", "role": "soc"},
+    )
+    assert resp.status_code == 403
+
+
+def test_patch_user_change_role(
+    client: FlaskClient, admin_token: str, soc_user: User
+) -> None:
+    resp = client.patch(
+        f"/api/users/{soc_user.id}",
+        headers=_h(admin_token),
+        json={"role": "redteam"},
+    )
+    assert resp.status_code == 200
+    assert resp.get_json()["role"] == "redteam"
+
+
+def test_patch_user_change_password(
+    client: FlaskClient, admin_token: str, soc_user: User
+) -> None:
+    resp = client.patch(
+        f"/api/users/{soc_user.id}",
+        headers=_h(admin_token),
+        json={"password": "anotherone1"},
+    )
+    assert resp.status_code == 200
+    # New password should now allow login.
+    login = client.post(
+        "/api/auth/login", json={"username": "soc1", "password": "anotherone1"}
+    )
+    assert login.status_code == 200
+
+
+def test_patch_user_short_password(
+    client: FlaskClient, admin_token: str, soc_user: User
+) -> None:
+    resp = client.patch(
+        f"/api/users/{soc_user.id}",
+        headers=_h(admin_token),
+        json={"password": "no"},
+    )
+    assert resp.status_code == 400
+
+
+def test_patch_user_404(client: FlaskClient, admin_token: str) -> None:
+    resp = client.patch(
+        "/api/users/9999", headers=_h(admin_token), json={"role": "soc"}
+    )
+    assert resp.status_code == 404
+
+
+def test_patch_user_forbidden_for_redteam(
+    client: FlaskClient, redteam_token: str, soc_user: User
+) -> None:
+    resp = client.patch(
+        f"/api/users/{soc_user.id}", headers=_h(redteam_token), json={"role": "admin"}
+    )
+    assert resp.status_code == 403
+
+
+def test_delete_user_success(
+    client: FlaskClient, admin_token: str, soc_user: User
+) -> None:
+    resp = client.delete(f"/api/users/{soc_user.id}", headers=_h(admin_token))
+    assert resp.status_code == 204
+
+
+def test_delete_last_admin_blocked(
+    client: FlaskClient, admin_user: User, admin_token: str
+) -> None:
+    resp = client.delete(f"/api/users/{admin_user.id}", headers=_h(admin_token))
+    assert resp.status_code == 409
+    assert "last admin" in resp.get_json()["error"]
+
+
+def test_delete_admin_when_other_admin_exists(
+    client: FlaskClient, admin_user: User, admin_token: str
+) -> None:
+    other = User(
+        username="admin2",
+        password_hash=hash_password("adminpass2"),
+        role=UserRole.ADMIN,
+    )
+    db.session.add(other)
+    db.session.commit()
+    other_id = other.id
+
+    resp = client.delete(f"/api/users/{other_id}", headers=_h(admin_token))
+    assert resp.status_code == 204
+
+
+def test_demote_last_admin_blocked(
+    client: FlaskClient, admin_user: User, admin_token: str
+) -> None:
+    resp = client.patch(
+        f"/api/users/{admin_user.id}",
+        headers=_h(admin_token),
+        json={"role": "redteam"},
+    )
+    assert resp.status_code == 409
+
+
+def test_delete_user_404(client: FlaskClient, admin_token: str) -> None:
+    resp = client.delete("/api/users/9999", headers=_h(admin_token))
+    assert resp.status_code == 404
+
+
+def test_delete_user_forbidden_for_soc(
+    client: FlaskClient, soc_token: str, redteam_user: User
+) -> None:
+    resp = client.delete(f"/api/users/{redteam_user.id}", headers=_h(soc_token))
+    assert resp.status_code == 403