chore: clean up scratch files and apply remaining updates

lib/seo.ts

@@ -0,0 +1,45 @@
+import type { Metadata } from 'next'
+
+export const SITE_URL = 'https://marmarislocal.com'
+export const LOCALES = ['tr', 'en', 'ru'] as const
+
+/**
+ * Builds self-referencing canonical + reciprocal hreflang alternates for a given
+ * request pathname (as set by proxy.ts on `x-pathname`, e.g. "/en/restoran/foo").
+ * x-default falls back to the site's default locale (tr).
+ */
+export function buildAlternates(pathname: string): Metadata['alternates'] {
+  const segments = pathname.split('/').filter(Boolean)
+  const currentLocale = LOCALES.includes(segments[0] as any) ? segments[0] : 'tr'
+  const rest = segments.slice(LOCALES.includes(segments[0] as any) ? 1 : 0).join('/')
+  const suffix = rest ? `/${rest}` : ''
+
+  const languages: Record<string, string> = {}
+  for (const locale of LOCALES) {
+    languages[locale] = `${SITE_URL}/${locale}${suffix}`
+  }
+  languages['x-default'] = `${SITE_URL}/tr${suffix}`
+
+  return {
+    canonical: `${SITE_URL}/${currentLocale}${suffix}`,
+    languages,
+  }
+}
+
+export function ogLocale(locale: string): string {
+  return locale === 'en' ? 'en_US' : locale === 'ru' ? 'ru_RU' : 'tr_TR'
+}
+
+/**
+ * Metadata for pages that only need a localized title/description, but still
+ * want their own Open Graph/Twitter tags instead of inheriting the layout's
+ * generic sitewide fallback (which would otherwise show on every such page).
+ */
+export function basicMetadata(title: string, description: string): Metadata {
+  return {
+    title,
+    description,
+    openGraph: { title, description, type: 'website' },
+    twitter: { card: 'summary_large_image', title, description },
+  }
+}