Productionize WP Suite: auth, security hardening, sync, dashboard, PWA, email

Brings the Work Package Suite from a browser-local prototype to a
multi-tenant, SQL-backed deployment hardened for customer IP.

Auth & access control
- Local username/password login (bcrypt + JWT in an HttpOnly cookie),
  admin-managed users, per-project membership, and project-scoped API access.
- Admin console: change user roles, view the audit trail, manage settings.

Security hardening
- CSP / HSTS / X-Frame-Options / nosniff headers in nginx; Secure cookie via
  X-Forwarded-Proto; CSRF Origin check; attribute-safe output escaping.
- Login lockout, token_version session revocation, stronger password policy,
  fail-closed secret loading, encrypted (AES-256) database backups.

Persistence & schema
- SOPs and Work Packages are now DB-backed and shared across users, written
  through a durable client sync outbox that queues offline edits.
- Alembic migrations applied automatically on container start.

New capabilities
- Phase 2 dashboard (progress, gating, pagination, archive).
- Phase 3 PWA "Field View" with offline caching and auth fallback.
- WP owner assignment with OPTIONAL email notifications, OFF by default and
  toggled from the admin console. SMTP password is read only from the
  SMTP_PASSWORD env var (never stored); emails carry a WP number + deep link,
  never customer IP.

Also: IBM Carbon restyle, Help section, and DEPLOYMENT.md brought up to date.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

nginx-wp-suite.conf

@@ -34,6 +34,13 @@ server {
     root /var/www/wp-suite;                        # <-- web root
     index index.html;
 
+    # ── Security response headers (defense-in-depth) ─────────────────────────
+    add_header X-Content-Type-Options "nosniff" always;
+    add_header X-Frame-Options "SAMEORIGIN" always;
+    add_header Referrer-Policy "no-referrer" always;
+    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
+    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob:; font-src 'self'; connect-src 'self'; object-src 'none'; base-uri 'none'; frame-ancestors 'self'; form-action 'self'" always;
+
     location / {
         try_files $uri $uri/ =404;
     }