Update project configuration and templates

.env.example

@@ -1,9 +1,15 @@
 # Security
 SECRET_KEY=change-me-in-production
 
-# Admin access control (comma-separated IPs, empty = allow all)
+# Admin session secret (separate from SECRET_KEY)
+# ADMIN_SESSION_SECRET=
+
+# Admin panel access control (comma-separated IPs, empty = allow all)
 # ALLOWED_ADMIN_IPS=192.168.1.1,10.0.0.5
 
+# Admin panel (enable only for configuration, then disable)
+ADMIN_PANEL_ENABLED=false
+
 # Database (optional, defaults to sqlite)
 # DATABASE_URL=sqlite:///data/tnproxy.db