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/PasswordSection.tsx

@@ -0,0 +1,54 @@
+'use client'
+
+import { useDjangoFormCore } from 'mizan'
+import { useStyles } from '../../contexts/StylesContext'
+import { SettingsSection, Button } from './SettingsComponents'
+
+export function PasswordSection() {
+    const styles = useStyles()
+    const form = useDjangoFormCore<Record<string, unknown>>({ name: 'change_password' })
+
+    const handleSubmit = async (e: React.FormEvent) => {
+        e.preventDefault()
+        const result = await form.submit()
+        if (result.success) {
+            form.reset()
+            alert('Password changed successfully!')
+        }
+    }
+
+    if (form.loading) return null
+
+    return (
+        <SettingsSection title={form.schema?.title || 'Change Password'}>
+            <form onSubmit={handleSubmit} className={styles.form}>
+                <div className={styles.fieldsContainer}>
+                    {form.schema?.fieldOrder.map(fieldName => {
+                        const field = form.schema!.fields[fieldName]
+                        return (
+                            <div key={fieldName} className={styles.field}>
+                                <label className={styles.fieldLabel}>{field.label}</label>
+                                <input
+                                    type={field.type}
+                                    value={(form.data[fieldName] as string) || ''}
+                                    onChange={(e) => form.set(fieldName, e.target.value)}
+                                    onBlur={() => form.touch(fieldName)}
+                                    className={styles.fieldInput}
+                                    required={field.required}
+                                />
+                                {form.touchedFields.has(fieldName) &&
+                                    form.getFieldErrors(fieldName).map((err, i) => (
+                                        <p key={i} className={styles.fieldError}>{err.message}</p>
+                                    ))
+                                }
+                            </div>
+                        )
+                    })}
+                </div>
+                <Button type="submit" disabled={form.submitting}>
+                    {form.submitting ? 'Changing...' : (form.schema?.submit_label || 'Change Password')}
+                </Button>
+            </form>
+        </SettingsSection>
+    )
+}