prepare app for public app store distribution

- rebrand from 습관 트래커 to 해빗랩 across templates, manifest, service worker
- add HTTPS redirect middleware for reverse-proxied deployments
- add public landing page (/) and privacy policy page with real data
  handling disclosures
- add in-app account deletion (Apple review requirement)
- add Android TWA Digital Asset Links support (/.well-known/assetlinks.json)
- add SFTP deployment script for the Synology-hosted server

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

README.md

@@ -1,4 +1,4 @@
-# 습관 트래커
+# 해빗랩
 
 개인용 습관 관리 PWA. 아이폰과 PC에서 같은 서버(MariaDB)에 접속해 습관을 관리합니다.