feat(app): câbler router Sprint 1 — login/register/dashboard + redirect / (étape 4)

src/app/router.tsx

@@ -1,14 +1,39 @@
 import React, { Suspense } from 'react'
-import { Routes, Route } from 'react-router-dom'
+import { Navigate, Routes, Route } from 'react-router-dom'
+
+import { LoginPage } from '@/features/auth/pages/LoginPage'
+import { RegisterPage } from '@/features/auth/pages/RegisterPage'
+import { ProtectedRoute } from '@/features/auth/components/ProtectedRoute'
 
 const DesignSystemPage = import.meta.env.DEV
   ? React.lazy(() => import('@/features/design-system/DesignSystemPage'))
   : () => null
 
+function DashboardStub() {
+  return (
+    <main className="min-h-screen bg-canvas p-6">
+      <h1 className="text-2xl font-semibold text-ink-1">Dashboard — stub</h1>
+      <p className="mt-2 text-sm text-ink-3">
+        Cette vue sera remplacée par DashboardPage au prochain lot du Sprint 1.
+      </p>
+    </main>
+  )
+}
+
 export function AppRouter() {
   return (
     <Routes>
-      <Route path="/" element={<ScaffoldPlaceholder />} />
+      <Route path="/" element={<Navigate to="/dashboard" replace />} />
+      <Route path="/login" element={<LoginPage />} />
+      <Route path="/register" element={<RegisterPage />} />
+      <Route
+        path="/dashboard"
+        element={
+          <ProtectedRoute>
+            <DashboardStub />
+          </ProtectedRoute>
+        }
+      />
       {import.meta.env.DEV && (
         <Route
           path="/design-system"
@@ -22,12 +47,3 @@ export function AppRouter() {
     </Routes>
   )
 }
-
-function ScaffoldPlaceholder() {
-  return (
-    <main className="p-6">
-      <h1 className="text-2xl font-semibold">Expria — scaffold Sprint 0</h1>
-      <p>Aucune feature n'est encore branchée. Les routes seront ajoutées au fil des sprints.</p>
-    </main>
-  )
-}