C-2: JWT moved from localStorage to httpOnly cookie (eliminates XSS token theft)
C-3: WebSocket auth via short-lived single-use tickets (JWT no longer in URLs)
H-1: JWT expiry reduced from 7 days to 4 hours
H-3: TOTP secrets encrypted at rest with vault EncryptionService (auto-migrates plaintext)
H-6: Rate limiting via @nestjs/throttler (60 req/min global, tighten on auth)
H-8: Constant-time login — Argon2id verify runs against dummy hash for non-existent users
H-9: Password hashing upgraded from bcrypt(10) to Argon2id (auto-upgrades on login)
H-10: Credential list API no longer returns encrypted blobs
H-16: Admin pages use Nuxt route middleware instead of client-side guard
Plus: auth bootstrap plugin, cookie-parser middleware, all frontend Authorization headers removed
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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