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/migrations/versions/0001_initial_schema.py

@@ -0,0 +1,60 @@
+"""initial schema: users + engagements
+
+Revision ID: 0001
+Revises:
+Create Date: 2026-05-26 00:00:00.000000
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "0001"
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.create_table(
+        "users",
+        sa.Column("id", sa.Integer(), primary_key=True),
+        sa.Column("username", sa.String(length=64), nullable=False),
+        sa.Column("password_hash", sa.String(length=255), nullable=False),
+        sa.Column(
+            "role",
+            sa.Enum("admin", "redteam", "soc", name="user_role"),
+            nullable=False,
+        ),
+        sa.Column("created_at", sa.DateTime(), nullable=False),
+        sa.UniqueConstraint("username", name="uq_users_username"),
+    )
+    op.create_index("ix_users_username", "users", ["username"], unique=True)
+
+    op.create_table(
+        "engagements",
+        sa.Column("id", sa.Integer(), primary_key=True),
+        sa.Column("name", sa.String(length=255), nullable=False),
+        sa.Column("description", sa.Text(), nullable=True),
+        sa.Column("start_date", sa.Date(), nullable=False),
+        sa.Column("end_date", sa.Date(), nullable=True),
+        sa.Column(
+            "status",
+            sa.Enum("planned", "active", "closed", name="engagement_status"),
+            nullable=False,
+        ),
+        sa.Column("created_at", sa.DateTime(), nullable=False),
+        sa.Column("created_by_id", sa.Integer(), nullable=False),
+        sa.ForeignKeyConstraint(
+            ["created_by_id"], ["users.id"], ondelete="RESTRICT",
+            name="fk_engagements_created_by_id_users",
+        ),
+    )
+
+
+def downgrade():
+    op.drop_table("engagements")
+    op.drop_index("ix_users_username", table_name="users")
+    op.drop_table("users")
+    sa.Enum(name="engagement_status").drop(op.get_bind(), checkfirst=True)
+    sa.Enum(name="user_role").drop(op.get_bind(), checkfirst=True)