sync: add AI review pipeline, parallel skill-files fetch, Redis cache improvements

- feat(review): add skill_reviews table, review API endpoints (pending/submit/stats), admin auth
- perf: parallel file fetching in skill-files API (was sequential → timeout)
- fix: handle Date serialization from Redis cache
- fix: align curation batch scripts with current browseReadyFilter

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

apps/web/app/[locale]/skill/[...id]/page.tsx

@@ -118,7 +118,7 @@ export default async function SkillPage({ params }: SkillPageProps) {
     securityStatus: dbSkill.securityStatus || 'pass',
     isVerified: dbSkill.isVerified || false,
     createdAt: dbSkill.createdAt,
-    updatedAt: dbSkill.updatedAt ? dbSkill.updatedAt.toLocaleDateString(locale === 'fa' ? 'fa-IR' : 'en-US') : 'N/A',
+    updatedAt: dbSkill.updatedAt ? new Date(dbSkill.updatedAt).toLocaleDateString(locale === 'fa' ? 'fa-IR' : 'en-US') : 'N/A',
     rating: dbSkill.rating || 0,
     ratingCount: dbSkill.ratingCount || 0,
     sourceFormat: dbSkill.sourceFormat || 'skill.md',