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>

app/static/manifest.json

@@ -1,6 +1,6 @@
 {
-  "name": "습관 트래커",
-  "short_name": "습관 트래커",
+  "name": "해빗랩",
+  "short_name": "해빗랩",
   "description": "형성하고 싶은 습관과 끊고 싶은 습관을 요일별로 관리하고 매일 체크하는 개인용 습관 관리 앱",
   "start_url": "/today",
   "scope": "/",