feat(palettes): add vuetify0 brand palette

[johnleider]

Summary

• New tokenized palette at @vuetify/v0/palettes/vuetify0 with 11 hues × 11 shades (50–950) anchored on v0's signature hex values — violet.500 = #7c5cf6, violet.300 = #c4b5fd (the light/dark primary tones the v0 themes already use), indigo.500 = #6366f1 (accent), slate.500 = #64748b (secondary), plus semantic + neutral scales matching the v0 theme tokens.
• Wired ./palettes/vuetify0 into publishConfig.exports and the dev exports block of packages/0/package.json (mirrors the tailwind shape).
• Surfaced in the docs palette browser (DocsPaletteBrowse.vue) as the first option under namespace v0, set as the default selection so the v0 docs open on the v0 palette.
• Documented in the Static Palettes table on /guide/features/palettes.

Usage

import { vuetify0 } from '@vuetify/v0/palettes/vuetify0'

app.use(
  createThemePlugin({
    palette: { v0: vuetify0 },
    themes: {
      light: {
        colors: {
          primary: '{palette.v0.violet.500}',
          secondary: '{palette.v0.slate.500}',
          accent: '{palette.v0.indigo.500}',
        },
      },
    },
  })
)

[pkg-pr-new]

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commit: 2281d39