fix(security): implement all 15 security fixes from penetration test V1

Security audit (2026-03-31): 5 HIGH + 10 MEDIUM issues, all fixed.

HIGH:
- H1: JWT password_version mechanism (pwv in Claims, middleware verification,
  auto-increment on password change)
- H2: Docker saas port bound to 127.0.0.1
- H3: TOTP encryption key decoupled from JWT secret (production bailout)
- H4+H5: Tauri CSP hardened (removed unsafe-inline, restricted connect-src)

MEDIUM:
- M1: Persistent rate limiting (PostgreSQL rate_limit_events table)
- M2: Account lockout (5 failures -> 15min lock)
- M3: RFC 5322 email validation with regex
- M4: Device registration typed struct with length limits
- M5: Provider URL validation on create/update (SSRF prevention)
- M6: Legacy TOTP secret migration (fixed nonce -> random nonce)
- M7: Legacy frontend crypto migration (static salt -> random salt)
- M8+M9: Admin frontend: removed JS token storage, HttpOnly cookie only
- M10: Pipeline debug log sanitization (keys only, 100-char truncation)

Also: fixed CLAUDE.md Section 12 (was corrupted), added title.rs middleware
skeleton, fixed RegisterDeviceRequest visibility.

admin-v2/src/router/AuthGuard.tsx

@@ -3,10 +3,10 @@
 // ============================================================
 //
 // Auth strategy:
-//   1. If Zustand has token (normal flow after login) → authenticated
-//   2. If no token but account in localStorage → call GET /auth/me
+//   1. If Zustand has isAuthenticated=true (normal flow after login) -> authenticated
+//   2. If isAuthenticated=false but account in localStorage -> call GET /auth/me
 //      to validate HttpOnly cookie and restore session
-//   3. If cookie invalid → clean up and redirect to /login
+//   3. If cookie invalid -> clean up and redirect to /login
 
 import { useEffect, useRef, useState } from 'react'
 import { Navigate, useLocation } from 'react-router-dom'
@@ -15,7 +15,7 @@ import { useAuthStore } from '@/stores/authStore'
 import { authService } from '@/services/auth'
 
 export function AuthGuard({ children }: { children: React.ReactNode }) {
-  const token = useAuthStore((s) => s.token)
+  const isAuthenticated = useAuthStore((s) => s.isAuthenticated)
   const account = useAuthStore((s) => s.account)
   const login = useAuthStore((s) => s.login)
   const logout = useAuthStore((s) => s.logout)
@@ -29,15 +29,14 @@ export function AuthGuard({ children }: { children: React.ReactNode }) {
     if (restoreAttempted.current) return
     restoreAttempted.current = true
 
-    // If no in-memory token but account exists in localStorage,
+    // If not authenticated but account exists in localStorage,
     // try to validate the HttpOnly cookie via /auth/me
-    if (!token && account) {
+    if (!isAuthenticated && account) {
       setRestoring(true)
       authService.me()
         .then((meAccount) => {
           // Cookie is valid — restore session
-          // Use sentinel token since real auth is via HttpOnly cookie
-          login('cookie-session', '', meAccount)
+          login(meAccount)
           setRestoring(false)
         })
         .catch(() => {
@@ -56,7 +55,7 @@ export function AuthGuard({ children }: { children: React.ReactNode }) {
     )
   }
 
-  if (!token) {
+  if (!isAuthenticated) {
     return <Navigate to="/login" state={{ from: location }} replace />
   }