Update for template syntax

[TepMan]

Hi,

according to HA release notes, the old platform template syntax for sensors is deprecated and will be removed in HA 2026.6, the templates should look like this:

template:
  - sensor:
      - name: "Freifunk Router Online Status"
        unique_id: mein_freifunk_router_online
        icon: >
          {% if states('sensor.mein_freifunk_router_online') == 'online' %}
            mdi:router-wireless
          {% else %}
            mdi:router-wireless-off
          {% endif %}
        state: >
          {% set my_router = state_attr('sensor.freifunk_mein_router_daten', 'nodes')[0] | default({}) %}
          {% if my_router and my_router.status == 'online' %}
            online
          {% else %}
            offline
          {% endif %}

      - name: "Freifunk Router Clients"
        unique_id: mein_freifunk_router_clients
        unit_of_measurement: "Clients"
        icon: mdi:account-group
        state: >
          {% set my_router = state_attr('sensor.freifunk_mein_router_daten', 'nodes')[0] | default({}) %}
          {{ my_router.clients if my_router and my_router.clients is defined else 0 }}

      - name: "Mein Freifunk Router Last (LoadAvg)"
        unique_id: mein_freifunk_router_loadavg
        icon: mdi:cpu-32-bit
        state: >
          {% set my_router = state_attr('sensor.freifunk_mein_router_daten', 'nodes')[0] | default({}) %}
          {{ my_router.loadavg if my_router and my_router.loadavg is defined else 0.0 }}

      - name: "Freifunk Router Firmware"
        unique_id: mein_freifunk_router_firmware
        icon: mdi:chip
        state: >
          {% set my_router = state_attr('sensor.freifunk_mein_router_daten', 'nodes')[0] | default({}) %}
          {{ my_router.firmware if my_router and my_router.firmware is defined else 'Unbekannt' }}

      - name: "Freifunk Router Letzter Kontakt"
        unique_id: mein_freifunk_router_letzter_kontakt
        device_class: timestamp
        icon: mdi:clock-time-four-outline
        state: >
          {% set my_router = state_attr('sensor.freifunk_mein_router_daten', 'nodes')[0] | default({}) %}
          {{ my_router.lastcontact if my_router and my_router.lastcontact is defined else None }}