feat: bootstrap webspace deploy and status-beacon landing page

Add public/index.php, private config bootstrap, FTPS deploy script,
and complete todo/01 including Let's Encrypt, HTTPS redirect, and HSTS docs.

Co-authored-by: Cursor <cursoragent@cursor.com>

.env.example

@@ -12,6 +12,8 @@ FTP_USER=
 FTP_PASSWORD=
 # Relativer Pfad zum Document Root (in Plesk prüfen, typisch httpdocs)
 FTP_REMOTE_PATH=httpdocs
+# Ausserhalb Document Root — nicht öffentlich (config, .env, data)
+FTP_PRIVATE_PATH=private
 
 # --- Domain & Server ---
 DOMAIN=0012.de