feat(search): add FTS5 full-text search option

[benjamincanac]

Summary

• Add search.fts app config option to switch from client-side Fuse.js to SQLite FTS5 via useSearchCollection
• Extract search logic into a new AppSearch.vue component (removes duplication between app.vue and error.vue)
• When FTS is enabled, the index is deferred until the palette opens and top-level navigation links fill the empty state
• Bump @nuxt/content to ^3.14.0 and @nuxt/ui to ^4.8.0 for useSearchCollection and the search prop support
• Document the option in both EN and FR configuration docs

Usage

// app.config.ts
export default defineAppConfig({
  search: {
    fts: true
  }
})

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Project	Deployment	Actions	Updated (UTC)
docus	Ready	Preview	Jun 5, 2026 1:27pm

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commit: 938e5ed