feat(ui): adopt Tailwind v4 design system and archive change

- Add tailwindcss v4 + @tailwindcss/vite to mall, shop-admin, admin
- Add @vmall/shared/theme.css tokens with html[data-accent] presets
- Add @vmall/ui kit (VBtn/VBadge/VField/VInput/VCard/VPanel/VTable/VPage,
  VAccentSwatch, useAccent) as a Nuxt module
- Convert all three apps to kit + utilities; delete ui.css/mall.css and
  every <style scoped>; consoles get accent presets, mall locked to red
- Fix VCard boolean prop default (padding) and PDP/store stale
  useAsyncData keys on param navigation
- Archive adopt-tailwind-design-system; new frontend-ui capability spec

apps/mall/components/ui/RatingStars.vue

@@ -4,16 +4,7 @@ const stars = computed(() => [1, 2, 3, 4, 5].map((i) => i <= Math.round(props.va
 </script>
 
 <template>
-  <span class="stars" :style="{ fontSize: `${size}px` }">
-    <span v-for="(on, i) in stars" :key="i" :class="{ on }">★</span>
+  <span :style="{ fontSize: `${size}px` }">
+    <span v-for="(on, i) in stars" :key="i" :class="on ? 'text-primary' : 'text-[#ddd]'">★</span>
   </span>
 </template>
-
-<style scoped>
-.stars span {
-  color: #ddd;
-}
-.stars span.on {
-  color: var(--mall-red);
-}
-</style>