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/home.html

@@ -0,0 +1,60 @@
+{% extends "base.html" %}
+{% block title %}해빗랩 · 습관이 만들어지는 진짜 시간{% endblock %}
+{% block content %}
+<div class="landing">
+  <div class="landing-hero">
+    <div class="landing-brand"><img src="/static/icons/icon-192.png" alt="" /> 해빗랩</div>
+    <h1>습관이 만들어지는<br />진짜 시간</h1>
+    <p class="landing-tagline">21일의 법칙 대신, 습관마다 다른 진짜 목표 기간을 알려드려요</p>
+
+    <div class="landing-streak" aria-hidden="true">
+      <div class="landing-day done">
+        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><path d="M5 12l5 5 9-9" /></svg>
+      </div>
+      <div class="landing-day done">
+        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><path d="M5 12l5 5 9-9" /></svg>
+      </div>
+      <div class="landing-day done">
+        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><path d="M5 12l5 5 9-9" /></svg>
+      </div>
+      <div class="landing-day done">
+        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><path d="M5 12l5 5 9-9" /></svg>
+      </div>
+      <div class="landing-day done">
+        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><path d="M5 12l5 5 9-9" /></svg>
+      </div>
+      <div class="landing-day">토</div>
+      <div class="landing-day">일</div>
+    </div>
+  </div>
+
+  <div class="landing-copy">
+    <p>
+      "습관은 21일이면 만들어진다"는 말, 많이 들어보셨을 거예요. 사실 근거가 약한 통설이에요.
+      실증 연구(<strong>Lally et al., 2010, UCL</strong>)에 따르면 습관이 몸에 붙기까지 걸리는 시간은
+      사람마다, 습관마다 달라서 짧게는 3주, 길게는 8개월 넘게 걸리기도 해요.
+    </p>
+    <p>
+      <strong>해빗랩</strong>은 여러분이 만들고 싶은 습관도, 멈추고 싶은 습관도 함께 만들어가는 동반자예요.
+      검증된 연구를 시스템에 그대로 담아 목표 기간과 진행 상황을 짚어드리고, 그 여정을 끝까지 응원할게요.
+    </p>
+  </div>
+
+  <div class="landing-features">
+    <div class="landing-feature">
+      <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="9" /><circle cx="12" cy="12" r="5" /><circle cx="12" cy="12" r="1" /></svg>
+      <p><strong>연구 기반 목표 기간</strong>속설이 아니라 실제 연구값(21·66·254일)으로 목표를 잡아요</p>
+    </div>
+    <div class="landing-feature">
+      <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="8" cy="12" r="6" /><line x1="8" y1="9" x2="8" y2="15" /><line x1="5" y1="12" x2="11" y2="12" /><circle cx="17" cy="12" r="6" /><line x1="14" y1="12" x2="20" y2="12" /></svg>
+      <p><strong>만들기와 끊기, 동시에</strong>새 습관을 만드는 것과 나쁜 습관을 끊는 것을 똑같은 무게로 다뤄요</p>
+    </div>
+    <div class="landing-feature">
+      <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="9" /><line x1="6" y1="6" x2="18" y2="18" /></svg>
+      <p><strong>광고·구독 없음</strong>습관관리에만 집중해요, 그 외엔 아무것도 없어요</p>
+    </div>
+  </div>
+
+  <a href="/auth/google/login" class="btn btn-primary btn-block">Google로 시작하기</a>
+</div>
+{% endblock %}