Wire Beszel fleet filesystems, GPU telemetry, dashboard and alerts

playbooks/beszel-filesystems.yaml

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+steps:
+  - name: Back up agent environment before filesystem wiring
+    sudo: true
+    shell: cp -p {{ stack_dir }}/.env {{ stack_dir }}/.env.before-fleet-wiring-20260910
+    creates: '{{ stack_dir }}/.env.before-fleet-wiring-20260910'
+  - name: Select canonical host filesystem override
+    sudo: true
+    shell: |
+      set -euo pipefail
+      cd {{ stack_dir }}
+      sed -i '/^COMPOSE_FILE=/d; /^BESZEL_EXTRA_FS=/d' .env
+      printf '\nCOMPOSE_FILE=compose.yaml:hosts/{{ host_name }}.yaml\nBESZEL_EXTRA_FS={{ extra_fs }}\n' >> .env
+      docker compose config --quiet
+      docker compose up -d --pull never beszel-agent
+verify:
+  - name: Verify running mounts and process health
+    sudo: true
+    shell: |
+      docker inspect beszel-agent --format '{{json .Mounts}}'
+      docker inspect beszel-agent | python3 -c 'import json,sys; print([e for e in json.load(sys.stdin)[0]["Config"]["Env"] if e.startswith("EXTRA_FILESYSTEMS=")])'
+      docker exec beszel-agent /agent health
+    changed_when: 'false'