feat(curation): auto-curation after crawl + quality messaging

Automate curation:
- Add runPostCrawlCuration() to DB queries — runs after every
  full and incremental crawl (classify, dedup, category counts)
- No more need for manual curate.mjs runs after each crawl

Quality messaging:
- Homepage stats label: "Skills" → "Curated Skills" (en/fa)
- Add curation note: "deduplicated and quality-filtered from X+ repos"
- Update fallback counts from 172K to 16K across all touchpoints
  (BetaBanner, getting-started prompts, email templates)
- getting-started skill count query now uses browse-ready filter

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

apps/web/components/BetaBanner.tsx

@@ -35,7 +35,7 @@ export function BetaBanner() {
 
   if (!isVisible) return null;
 
-  const count = skillCount || (locale === 'fa' ? '۱۷۲k' : '172k');
+  const count = skillCount || (locale === 'fa' ? '۱۶k' : '16k');
 
   return (
     <div className="relative bg-gradient-to-r from-primary-600 to-primary-500 text-white">