Login + ABM de operadores + audit log con UI

Backend:
- 3 migrations: system_users (citext email único, password_hash, active),
  system_sessions (UUID + expires_at + revoked_at), ALTER audit_log con
  actor_user_id/actor_email/actor_ip/action_path/summary y entity_id NULL.
- src/modules/auth/: usersRepo, sessionsRepo, passwords (bcrypt cost 10),
  auth (login/logout), bootstrap (crea admin desde ADMIN_EMAIL/PASSWORD si
  la tabla está vacía). 4 tests passwords (hash distinto cada vez, verify
  rechaza, longitud mínima 8).
- middleware/requireAuth: lee cookie bot_session, busca sesión activa,
  popula req.user. Whitelist: /styles, /components, /lib, /login, /, /home
  y SPA paths (HTML carga sin auth, el JS gatea con /api/auth/me).
- middleware/auditWriter: registra cada POST/PUT/DELETE 2xx en audit_log
  con req.user, IP, body redactado (passwords/tokens/secrets). Handlers
  pueden enriquecer summary via res.locals.audit.
- routes: /api/auth/{login,logout,me} (cookie httpOnly + DB session),
  /api/system-users (ABM con guards: cant_delete_self, cant_deactivate_self,
  email único, password ≥ 8), /api/audit-log + /api/audit-log/actors.
- src/app.js: orden estricto — webhooks (sin auth) → auth routes (sin auth)
  → /login HTML → static → SPA HTML → requireAuth + auditWriter → API admin.

Bootstrap del primer admin se ejecuta en index.js antes de listen. Usa
ADMIN_EMAIL/ADMIN_PASSWORD/ADMIN_NAME del .env. Si no están seteados y la
tabla está vacía, warn y exit (nadie puede loguearse).

Frontend:
- /login.html + /login.js: form simple, POST a /api/auth/login con
  credentials:include, redirect a ?next=... o /home. Si ya hay sesión
  activa, va directo a /home.
- public/app.js gate: chequea /api/auth/me antes de initRouter; sin sesión
  redirige a /login?next=<path>. window.__USER__ disponible para shell.
- ops-shell: nav agrega "Operadores" + "Actividad". Header derecha muestra
  email del user + botón Salir (POST /api/auth/logout + redirect /login).
- system-users-crud: CRUD lista/form (estilo settings). Crear/editar/
  cambiar password/eliminar. UI muestra badge "Vos" + bloquea eliminarse
  ni desactivarse a uno mismo.
- audit-log: tabla read-only con filtros (actor, entity_type, since,
  search), paginación 50, badges por acción, modal de detalles con
  changes JSON. /api/audit-log/actors pobla el dropdown de operadores.

Smoke E2E: login OK + cookie set, /me 200; logout → /me 401; settings POST
genera fila en audit_log con actor_email + action_path; ABM crea/borra
operadores con guards; intentar borrarse devuelve 400 cant_delete_self.

161/161 tests verde (pre-existentes 157 + 4 passwords nuevos).

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

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