feat(FN-005): implement frontend foundation with auth and routing

- Add OIDC authentication with PKCE flow
- Create dashboard shell with sidebar and header
- Implement project management UI (list, create, detail)
- Add tool spawn page with tool/project selection
- Create tool instance detail page with status and controls
- Set up React Router with route guards
- Add Zustand auth store and API client with types

apps/web/src/router.tsx

@@ -0,0 +1,45 @@
+import { createBrowserRouter } from 'react-router-dom'
+import App from './App'
+import RouteGuard from './components/RouteGuard'
+import DashboardLayout from './components/DashboardLayout'
+import LoginPage from './pages/LoginPage'
+import CallbackPage from './pages/CallbackPage'
+import DashboardPage from './pages/DashboardPage'
+import ProjectListPage from './pages/ProjectListPage'
+import ProjectDetailPage from './pages/ProjectDetailPage'
+import ProjectFormPage from './pages/ProjectFormPage'
+import ToolsPage from './pages/ToolsPage'
+import ToolSpawnPage from './pages/ToolSpawnPage'
+import ToolInstanceDetailPage from './pages/ToolInstanceDetailPage'
+import SettingsPage from './pages/SettingsPage'
+import RepositoriesPage from './pages/RepositoriesPage'
+
+export const router = createBrowserRouter([
+  {
+    path: '/',
+    element: <App />,
+    children: [
+      {
+        element: (
+          <RouteGuard>
+            <DashboardLayout />
+          </RouteGuard>
+        ),
+        children: [
+          { path: '/', element: <DashboardPage /> },
+          { path: '/projects', element: <ProjectListPage /> },
+          { path: '/projects/new', element: <ProjectFormPage /> },
+          { path: '/projects/:id', element: <ProjectDetailPage /> },
+          { path: '/projects/:id/edit', element: <ProjectFormPage /> },
+          { path: '/tools', element: <ToolsPage /> },
+          { path: '/tools/spawn', element: <ToolSpawnPage /> },
+          { path: '/projects/:projectId/instances/:instanceId', element: <ToolInstanceDetailPage /> },
+          { path: '/settings', element: <SettingsPage /> },
+          { path: '/repositories', element: <RepositoriesPage /> },
+        ],
+      },
+      { path: '/login', element: <LoginPage /> },
+      { path: '/callback', element: <CallbackPage /> },
+    ],
+  },
+])