feat(perf-seo): exporter에 robots 메타 옵션 추가(TDD)

lib/exporter/html.ts

@@ -2,7 +2,7 @@ import type { Page, FormField } from '@/lib/schema/page'
 import type { AssetManager } from '@/lib/assets/assetManager'
 
 export type Exported = { html: string; css: string; js: string }
-export type ExportOptions = { assetManager?: AssetManager; fontPreconnect?: boolean }
+export type ExportOptions = { assetManager?: AssetManager; fontPreconnect?: boolean; robotsMeta?: string }
 
 function renderFaq(section: { props: { items: Array<{ q: string; a: string }> } }) {
   const itemsRaw: Array<{ q: string; a: string }> = Array.isArray(section.props.items) ? section.props.items : []
@@ -251,6 +251,7 @@ function buildHead(page: Page, opts?: ExportOptions) {
   }
   const custom = page.analytics?.customHeadHtml || ''
   const preconnect = opts?.fontPreconnect !== false
+  const robotsMeta = (opts?.robotsMeta && opts.robotsMeta.trim().length > 0) ? `<meta name="robots" content="${escapeHtml(opts!.robotsMeta!)}" />` : ''
   return `
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
@@ -259,6 +260,7 @@ function buildHead(page: Page, opts?: ExportOptions) {
     ${preconnect ? '<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />' : ''}
     <link rel="manifest" href="/site.webmanifest" />
     <meta name="theme-color" content="${escapeHtml(page.theme.primaryColor)}" />
+    ${robotsMeta}
     <title>${escapeHtml(page.seo.title)}</title>
     <meta name="description" content="${escapeHtml(page.seo.description)}" />
     <meta property="og:title" content="${escapeHtml(page.seo.title)}" />