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>

packages/mizan-react/src/client/react.ts

@@ -11,12 +11,7 @@ import {
 
 // Re-export everything from main entry for convenience
 export * from './index'
-
-// Re-export auth components for React users
-export * from './AuthContext'
 export * from '../jwt/JWTContext'
-export * from './RouterContext'
-export * from './routing'
 export type * from './types'
 
 /**

packages/mizan-react/vitest.config.ts

@@ -6,11 +6,8 @@ export default defineConfig({
         alias: {
             'mizan/channels': path.resolve(__dirname, 'src/channels/index.ts'),
             'mizan/client/react': path.resolve(__dirname, 'src/client/react.ts'),
-            'mizan/client/nextjs': path.resolve(__dirname, 'src/client/nextjs.tsx'),
             'mizan/client': path.resolve(__dirname, 'src/client/index.ts'),
             'mizan/jwt': path.resolve(__dirname, 'src/jwt/index.ts'),
-            'mizan/allauth/nextjs': path.resolve(__dirname, 'src/allauth/nextjs.tsx'),
-            'mizan/allauth': path.resolve(__dirname, 'src/allauth/index.ts'),
             'mizan': path.resolve(__dirname, 'src/index.ts'),
         },
     },