Wire Beszel fleet filesystems, GPU telemetry, dashboard and alerts

stacks/beszel/.env.example

@@ -36,8 +36,13 @@ BESZEL_AGENT_PORT=45876
 # Grab it by clicking "Add System" → copy the key shown in the dialog.
 BESZEL_HUB_KEY=
 
-# Extra filesystems to track beyond the root mount, comma-separated.
-# Examples:
-#   on ana-ml2: /tank
-#   on ana-docker: /mnt/backup,/mnt/compose
+# Docker must bind-mount extra filesystems; select this host's override.
+# Example for ana-ml2 (see README for the other hosts):
+# COMPOSE_FILE=compose.yaml:hosts/ana-ml2.yaml
+# BESZEL_EXTRA_FS=/extra-filesystems/tank,/extra-filesystems/home
+# Paths below are INSIDE the container, not unmounted host paths.
 BESZEL_EXTRA_FS=
+
+# Optional outbound agent authentication (leave blank for SSH-key mode).
+HUB_URL=
+BESZEL_TOKEN=