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]/docs/getting-started/page.tsx

@@ -6,6 +6,8 @@ import Link from 'next/link';
 import { ArrowLeft, ArrowRight } from 'lucide-react';
 import { createDb, skills, sql } from '@skillhub/db';
 import { formatPromptSkillCount } from '@/lib/format-number';
+import { getPageAlternates } from '@/lib/seo';
+
 
 export const dynamic = 'force-dynamic';
 
@@ -15,7 +17,7 @@ async function getSkillCount(): Promise<string> {
     const result = await db
       .select({ count: sql<number>`count(*)::int` })
       .from(skills)
-      .where(sql`${skills.isDuplicate} = false AND (${skills.skillType} IS NULL OR ${skills.skillType} != 'aggregator')`);
+      .where(sql`${skills.isDuplicate} = false`);
     return formatPromptSkillCount(result[0]?.count ?? 16000);
   } catch {
     return '16,000+';
@@ -56,6 +58,18 @@ Search for unfamiliar tech or complex tasks. Only install "Pass" security status
   };
 }
 
+
+export async function generateMetadata({
+  params,
+}: {
+  params: Promise<{ locale: string }>;
+}) {
+  const { locale } = await params;
+  return {
+    alternates: getPageAlternates(locale, '/docs/getting-started'),
+  };
+}
+
 export default async function GettingStartedPage({
   params,
 }: {