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/templates/login.html

@@ -1,9 +1,10 @@
 {% extends "base.html" %}
-{% block title %}로그인 · 습관 트래커{% endblock %}
+{% block title %}로그인 · 해빗랩{% endblock %}
 {% block content %}
 <div style="min-height: 70vh; display: flex; align-items: center; justify-content: center;">
   <div class="card" style="width: 100%; max-width: 320px;">
-    <h1 style="text-align:center;">습관 트래커</h1>
+    <h1 style="text-align:center;">해빗랩</h1>
+    {% if deleted %}<p style="text-align:center; color: var(--color-success);">계정이 삭제되었습니다.</p>{% endif %}
     <p style="text-align:center;">구글 계정으로 로그인하세요</p>
     <a href="/auth/google/login" class="btn btn-primary btn-block">Google로 로그인</a>
   </div>