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>

README.md

@@ -184,18 +184,6 @@ Always review skill source code before installing.
 
 ---
 
-## Roadmap
-
-- [x] Web marketplace with growing skill catalog
-- [x] CLI tool
-- [x] Multi-platform support
-- [x] Security scanning
-- [ ] Claude Code MCP plugin
-- [ ] AI-powered recommendations
-- [ ] Enterprise features
-
----
-
 ## License
 
 MIT - See [LICENSE](./LICENSE) for details.