feat(m3): RBAC — atomic perms, groups, users, admin SPA pages

Permission catalogue (services/permissions_seed.py)
- 31 atomic codes across 10 families: user.*, group.*, invitation.*,
  test_template.*, scenario_template.*, mission.* (incl.
  mission.write_red_fields + mission.write_blue_fields),
  detection_level.{read,update}, setting.{read,update}, mitre.sync.
- Default bindings: admin = all 31; redteam = 8 (catalogue read + mission.
  {read,create,update,archive,write_red_fields} + detection_level.read);
  blueteam = 5 (catalogue read + mission.{read,write_blue_fields} +
  detection_level.read).
- Seed runs at boot AND after /setup so a freshly truncated DB (via
  /diag/reset) gets the bindings back via the bootstrap path. Idempotent +
  additive (never removes a perm from a system group).

Users admin (services/users.py + api/users.py)
- list (q + is_active filter + pagination), get, patch (display_name /
  locale / is_active with tri-state sentinel for clear-vs-unset),
  soft-delete, set groups.
- Last-admin protection on update (deactivate), delete, and group-strip
  (refusing to remove the admin group from the last active admin).

Groups admin (services/groups.py + api/groups.py)
- Full CRUD with system-group protection (no rename, no delete on
  admin/redteam/blueteam).
- PUT /groups/{id}/permissions sets the perm list.
- Admin system group's perm set is locked to the full catalogue
  (SystemGroupProtected → 409) — preserves the bypass invariant even if a
  future refactor moves to perm-based checks.

Permissions read-only (api/permissions.py)
- GET /permissions returns the catalogue (admin or group.read holders).

/diag/reset extension
- After truncate + token mint, the limiter is also reset (limiter.reset())
  so the Playwright suite doesn't hit 10/min budgets across spec files.
  Guarded by limiter.enabled to no-op in APP_ENV=test.

Rate-limit scope (core/rate_limit.py)
- enabled = APP_ENV in ("prod", "staging"). A staging deployment serves
  humans, so it gets the limits too. Dev/test stay unthrottled for
  Playwright ergonomics. Spec §6 NF-security is an operator-facing
  requirement.

Frontend chrome
- components/RequireAdmin.tsx + ui/Modal.tsx (reusable centered dialog
  with accessible name + Escape + backdrop-click).
- Layout.tsx shows Admin nav links only when is_admin === true. Server
  remains the arbiter — non-admins hitting /admin/* get redirected to /.

Frontend pages
- pages/AdminUsersPage.tsx, AdminGroupsPage.tsx, AdminInvitationsPage.tsx
  with edit modals using TanStack Query mutations + multi-select for perms
  grouped by family + copy-once invitation URL display.
- lib/admin.ts: shared types + query keys + groupPermsByFamily helper.
- lib/api.ts: apiPatch / apiPut / apiDelete added.

Playwright config (e2e/playwright.config.ts)
- workers: 1 + fullyParallel: false: spec files share the live Postgres,
  so concurrent /diag/reset calls clobber each other. Intra-file order
  preserved via test.describe.configure({ mode: 'serial' }).

Testing
- backend/tests/test_rbac.py: 15 integration tests (39 backend total — 1
  health + 8 schema + 15 auth + 15 RBAC).
- e2e/tests/m3-rbac.spec.ts: 8 Playwright tests covering DoD §10 #2/#3
  (28 e2e total — 8 M0 + 4 M1 + 8 M2 + 8 M3).
- tasks/testing-m3.md.

DoD: make test-api → 39 passed, make e2e → 28 passed. Spec-reviewer pass
applied (admin perm invariant + staging rate-limit scope).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/app/api/permissions.py

@@ -0,0 +1,17 @@
+"""Read-only catalogue of platform permission codes."""
+
+from __future__ import annotations
+
+from flask import Blueprint, jsonify
+
+from app.core.auth_decorators import require_auth, require_perm
+from app.services import groups as groups_svc
+
+bp = Blueprint("permissions", __name__, url_prefix="/permissions")
+
+
+@bp.get("")
+@require_auth
+@require_perm("group.read")
+def list_permissions():
+    return jsonify({"items": groups_svc.list_permissions()})