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/app/api/users.py

@@ -0,0 +1,106 @@
+"""User management endpoints (admin only)."""
+from __future__ import annotations
+
+from flask import Blueprint, current_app, jsonify, request
+
+from backend.app.auth import hash_password, role_required
+from backend.app.extensions import db
+from backend.app.models import User, UserRole
+from backend.app.serializers import serialize_user
+
+users_bp = Blueprint("users", __name__, url_prefix="/api/users")
+
+
+def _parse_role(value: object) -> UserRole | None:
+    if not isinstance(value, str):
+        return None
+    try:
+        return UserRole(value)
+    except ValueError:
+        return None
+
+
+@users_bp.get("")
+@role_required("admin")
+def list_users():
+    users = User.query.order_by(User.id.asc()).all()
+    return jsonify([serialize_user(u) for u in users]), 200
+
+
+@users_bp.post("")
+@role_required("admin")
+def create_user():
+    data = request.get_json(silent=True) or {}
+    username = (data.get("username") or "").strip()
+    password = data.get("password") or ""
+    role_raw = (data.get("role") or "").strip()
+
+    if not username:
+        return jsonify({"error": "username is required"}), 400
+
+    min_len = current_app.config["MIN_PASSWORD_LENGTH"]
+    if len(password) < min_len:
+        return jsonify({"error": f"password must be at least {min_len} characters"}), 400
+
+    role = _parse_role(role_raw)
+    if role is None:
+        return jsonify({"error": "role must be one of: admin, redteam, soc"}), 400
+
+    if User.query.filter_by(username=username).first() is not None:
+        return jsonify({"error": "username already exists"}), 400
+
+    user = User(username=username, password_hash=hash_password(password), role=role)
+    db.session.add(user)
+    db.session.commit()
+    return jsonify(serialize_user(user)), 201
+
+
+@users_bp.patch("/<int:user_id>")
+@role_required("admin")
+def update_user(user_id: int):
+    user = db.session.get(User, user_id)
+    if user is None:
+        return jsonify({"error": "User not found"}), 404
+
+    data = request.get_json(silent=True) or {}
+
+    if "role" in data:
+        new_role = _parse_role((data.get("role") or "").strip())
+        if new_role is None:
+            return jsonify({"error": "role must be one of: admin, redteam, soc"}), 400
+        # Refuse to demote the last admin.
+        if user.role == UserRole.ADMIN and new_role != UserRole.ADMIN:
+            admin_count = User.query.filter_by(role=UserRole.ADMIN).count()
+            if admin_count <= 1:
+                return jsonify({"error": "Cannot demote the last admin"}), 409
+        user.role = new_role
+
+    if "password" in data:
+        password = data.get("password") or ""
+        min_len = current_app.config["MIN_PASSWORD_LENGTH"]
+        if len(password) < min_len:
+            return (
+                jsonify({"error": f"password must be at least {min_len} characters"}),
+                400,
+            )
+        user.password_hash = hash_password(password)
+
+    db.session.commit()
+    return jsonify(serialize_user(user)), 200
+
+
+@users_bp.delete("/<int:user_id>")
+@role_required("admin")
+def delete_user(user_id: int):
+    user = db.session.get(User, user_id)
+    if user is None:
+        return jsonify({"error": "User not found"}), 404
+
+    if user.role == UserRole.ADMIN:
+        admin_count = User.query.filter_by(role=UserRole.ADMIN).count()
+        if admin_count <= 1:
+            return jsonify({"error": "Cannot delete the last admin"}), 409
+
+    db.session.delete(user)
+    db.session.commit()
+    return "", 204