Add TZ variable to .env.example

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: jinglemansweep

.env.example

@@ -187,6 +187,11 @@ API_ADMIN_KEY=
 # External web port
 WEB_PORT=8080
 
+# Timezone for displaying dates/times on the web dashboard
+# Uses standard IANA timezone names (e.g., America/New_York, Europe/London)
+# Default: UTC
+TZ=UTC
+
 # -------------------
 # Network Information
 # -------------------