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/service-worker.js

@@ -78,7 +78,7 @@ self.addEventListener("push", (event) => {
   if (!event.data) return;
   const data = event.data.json();
   event.waitUntil(
-    self.registration.showNotification(data.title || "습관 트래커", {
+    self.registration.showNotification(data.title || "해빗랩", {
       body: data.body || "",
       icon: "/static/icons/icon-192.png",
       badge: "/static/icons/icon-192.png",