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/routers/push.py

@@ -42,5 +42,5 @@ def unsubscribe(
 
 @router.post("/test")
 def send_test(db: Session = Depends(get_db), current_user: User = Depends(require_login)):
-    sent = push_service.send_to_user(db, current_user.id, title="습관 트래커", body="테스트 알림입니다.")
+    sent = push_service.send_to_user(db, current_user.id, title="해빗랩", body="테스트 알림입니다.")
     return {"sent": sent}