feat(core)!: introduce runtime extension registry and flat module conventions

BREAKING CHANGE: sup config now derives entries from package.json#exports and a server/client glob instead of manual lists; module structure follows flat + barrel convention with .server.js/.client.js runtime suffixes

src/features/admin/AdminPage.client.js

@@ -1,11 +1,37 @@
 'use client';
 
-/**
- * Admin Pages Export for Next.js App Router
- * 
- * This exports the admin client components.
- * Users must create their own server component wrapper that uses protectAdmin.
- */
+import { getPage } from './registry.js';
+import './pages/index.client.js';
+import './widgets/index.client.js';
 
-export { default as AdminPagesClient } from './components/AdminPages.js';
-export { default as AdminPagesLayout } from './components/AdminPagesLayout.js';
+export default function AdminPageClient({ params, user, widgetData }) {
+  const parts = params?.admin || [];
+  const [first, second, third] = parts;
+
+  // Routes paramétrées — le registre stocke le composant sous un slug
+  // "namespace:form", le client y attache les bons props.
+  if (first === 'users' && second === 'edit' && third) {
+    const page = getPage('users:edit');
+    if (page) return <page.Component userId={third} user={user} />;
+  }
+  if (first === 'roles' && second === 'edit' && third) {
+    const page = getPage('roles:edit');
+    if (page) return <page.Component roleId={third} user={user} />;
+  }
+  if (first === 'roles' && second === 'new') {
+    const page = getPage('roles:edit');
+    if (page) return <page.Component roleId="new" user={user} />;
+  }
+
+  const slug = first || 'dashboard';
+  const page = getPage(slug) || getPage('dashboard');
+  if (!page) return null;
+
+  const { Component } = page;
+  // Le tableau de bord reçoit les données collectées côté serveur ; les
+  // autres pages ne connaissent pas le widget data.
+  if (slug === 'dashboard') {
+    return <Component user={user} stats={widgetData} />;
+  }
+  return <Component user={user} params={parts} />;
+}