build: configure pnpm workspace and presentation route

Point / at the presentation deck and add pnpm-workspace.yaml so pnpm
dev/build don't hard-fail on the ignored vue-demi build script.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

pnpm-workspace.yaml

@@ -0,0 +1,3 @@
+allowBuilds:
+  vue-demi: false
+verifyDepsBeforeRun: false

src/router/index.ts

@@ -3,8 +3,8 @@ import { createRouter, createWebHistory, type RouteRecordRaw } from 'vue-router'
 const routes: RouteRecordRaw[] = [
   {
     path: '/',
-    name: 'home',
-    component: () => import('@/views/HomeView.vue'),
+    name: 'presentation',
+    component: () => import('@/views/PresentationView.vue'),
   },
 ]