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/.well-known/assetlinks.json

@@ -0,0 +1,8 @@
+[{
+      "relation": ["delegate_permission/common.handle_all_urls"],
+      "target": {
+        "namespace": "android_app",
+        "package_name": "kr.co.alphalok.habit.twa",
+        "sha256_cert_fingerprints": ["2A:BC:19:7D:91:65:3A:88:68:02:8C:3B:1D:58:42:C7:17:02:FA:B9:C9:4F:01:02:3D:60:B7:C9:CE:6F:05:20"]
+      }
+    }]