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

packages/ui/src/components/VTable.vue

@@ -0,0 +1,9 @@
+<template>
+  <div class="overflow-x-auto rounded-lg border border-border bg-surface shadow-sm">
+    <table
+      class="w-full border-collapse [&_td]:border-b [&_td]:border-border [&_td]:px-3 [&_td]:py-2.5 [&_td]:text-left [&_td]:text-sm [&_th]:border-b [&_th]:border-border [&_th]:px-3 [&_th]:py-2.5 [&_th]:text-left [&_th]:text-[13px] [&_th]:font-semibold [&_th]:text-muted [&_tr:last-child_td]:border-b-0"
+    >
+      <slot />
+    </table>
+  </div>
+</template>