fix: support multiple appendTo entries

[pupuking723]

Fixes #746.

This lets appendTo accept multiple entry matchers:

vueDevTools({
  appendTo: [
    'resources/js/app.js',
    'resources/js/admin.js',
  ],
})

When appendTo is used, the devtools Vite plugin now injects both the devtools overlay and the inspector loader into matching entry modules. The inspector plugin still receives appendTo: 'manually' for this path, so we don't pass an array to vite-plugin-vue-inspector.

Verification:

• corepack pnpm exec vitest run packages/vite/__tests__/append-to.test.ts
• corepack pnpm exec eslint packages/vite/src/vite.ts packages/vite/__tests__/append-to.test.ts docs/guide/vite-plugin.md
• corepack pnpm run type-check
• corepack pnpm run build:vite
• git diff --check

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