sync: SEO canonical URLs, curation improvements, batch scripts, stats fix

- Dynamic canonical URLs and alternates for all pages (SEO fix)
- Shared seo.ts utility for canonical path generation
- Improved duplicate detection: standalone > aggregator priority, forks/created_at tie-breakers
- browseReadyFilter now includes unique aggregator skills
- Stats aligned with browseReadyFilter (was showing 16k instead of 62k+)
- Re-review mechanism: content_hash changes trigger needs-re-review
- review_status field added to skills schema
- Batch security scan and quality score scripts
- Indexer Dockerfile updated for curation deps
- Removed roadmap from README

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/app/[locale]/about/page.tsx

@@ -2,6 +2,20 @@ import { getTranslations, setRequestLocale } from 'next-intl/server';
 import { Header } from '@/components/Header';
 import { Footer } from '@/components/Footer';
 import { Code2, Globe, Shield } from 'lucide-react';
+import { getPageAlternates } from '@/lib/seo';
+
+
+
+export async function generateMetadata({
+  params,
+}: {
+  params: Promise<{ locale: string }>;
+}) {
+  const { locale } = await params;
+  return {
+    alternates: getPageAlternates(locale, '/about'),
+  };
+}
 
 export default async function AboutPage({
   params,