Move allauth + auth UI to legacy/

allauth/ (44 files) is a django-allauth React UI — a separate concern
from the Mizan protocol. Moved to legacy/ pending extraction into a
standalone mizan-django-allauth package.

Also moved to legacy/:
- client/AuthContext.tsx — generic auth state from /me endpoint
- client/RouterContext.tsx — framework-agnostic router adapter
- client/routing.tsx — UserRoute/StaffRoute/AnonymousRoute guards
- client/nextjs.tsx — Next.js router adapter for auth

These are auth UI infrastructure, not Mizan protocol. The Mizan core
only needs JWT for auth header selection (jwt/ stays — MizanProvider
depends on useJWT() to decide between Bearer and session auth).

Cleaned up re-exports in client/react.ts and vitest aliases.

33 React tests pass.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

legacy/allauth/components/settings/ProfileSection.tsx

@@ -0,0 +1,22 @@
+'use client'
+
+import { useUser } from '../../contexts/AuthContext'
+import { SettingsSection, SettingsItem, SettingsList } from './SettingsComponents'
+
+export function ProfileSection() {
+    const user = useUser()
+
+    return (
+        <SettingsSection title="Profile">
+            <SettingsList>
+                <SettingsItem label="Email" meta={user?.email} />
+                {user?.first_name && (
+                    <SettingsItem
+                        label="Name"
+                        meta={`${user.first_name} ${user.last_name || ''}`.trim()}
+                    />
+                )}
+            </SettingsList>
+        </SettingsSection>
+    )
+}