feat(core): allow hosts to override DevTools branding

[antfubot]

Description

Vite DevTools' branding (product name, logo, wordmark, primary color, tagline, favicon, window title) was hardcoded in viteDevToolsBranding() with no way for an embedding host to change it. This exposes a branding option so a host such as Nuxt DevTools can re-skin the client while inheriting any field it leaves unset.

The override threads through the existing ViteDevToolsUiOptions seam — DevTools({ branding }) → DevToolsServer/DevToolsBuild → createViteDevToolsUi → createUi({ branding }) — landing in ConnectionMeta.configs.ui.branding for both the dev-serve and static-build paths. A new resolveBranding() helper merges the host's overrides field-by-field over the built-in defaults, ignoring explicit undefined so a partial override never clobbers a default.

DevTools({
  branding: {
    productName: 'Nuxt DevTools',
    primaryColor: '#00dc82',
    logo: '/my-assets/nuxt-logo.svg',
    windowTitle: 'Nuxt DevTools',
  },
})

Docs updated with the option and an example. lint, typecheck, test, and build all pass (the tsnapi export-snapshot gate needs no update — it references the interfaces by name).

Linked Issues

Additional context

This PR was created with the help of an agent.

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commit: fac4203