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]/skill/[...id]/page.tsx

@@ -16,10 +16,32 @@ import { createDb, skillQueries } from '@skillhub/db';
 import { FORMAT_LABELS } from 'skillhub-core';
 import { formatCompactNumber } from '@/lib/format-number';
 import { shouldCountView } from '@/lib/cache';
+import type { Metadata } from 'next';
+import { getPageAlternates } from '@/lib/seo';
 
 // Force dynamic rendering to fetch fresh data from database
 export const dynamic = 'force-dynamic';
 
+export async function generateMetadata({
+  params,
+}: {
+  params: Promise<{ locale: string; id: string[] }>;
+}): Promise<Metadata> {
+  const { locale, id } = await params;
+  const skillId = id.join('/');
+
+  // Optionally fetch skill name for title
+  const dbSkill = await getSkill(skillId);
+  const title = dbSkill ? `${dbSkill.name} | SkillHub` : 'SkillHub';
+  const description = dbSkill ? dbSkill.description : undefined;
+
+  return {
+    title,
+    description,
+    alternates: getPageAlternates(locale, `/skill/${skillId}`),
+  };
+}
+
 interface SkillPageProps {
   params: Promise<{ locale: string; id: string[] }>;
 }
@@ -71,9 +93,9 @@ export default async function SkillPage({ params }: SkillPageProps) {
     const db = createDb();
     shouldCountView(dbSkill.id, clientIp).then((shouldCount) => {
       if (shouldCount) {
-        skillQueries.incrementViews(db, dbSkill.id).catch(() => {});
+        skillQueries.incrementViews(db, dbSkill.id).catch(() => { });
       }
-    }).catch(() => {});
+    }).catch(() => { });
   }
 
   // Map database response to expected format