fix: Pulizia topic legacy e discovery retention

- Rimosso vecchio topic homeassistant/sensor/voltronic/config all'avvio
- Aggiunto flag -r (retain) a tutti i discovery topics
- MQTT init eseguito immediatamente all'avvio + ogni 5 minuti
- Aggiunto unique_id e device info a tutti i sensori per HA
- mqtt-subscriber ora ascolta su 3 topic:
  - homeassistant/sensor/voltronic/command (legacy)
  - homeassistant/sensor/voltronic_inv1_raw_cmd/command
  - homeassistant/sensor/voltronic_inv2_raw_cmd/command
- Subscriber con output verbose e timestamp
- Discovery topics ora persistono dopo restart broker MQTT

Timing verificato:
- Init all'avvio: immediato
- Re-init periodico: ogni 5 minuti (300s)
- Data push: ogni 30 secondi

sources/inverter-mqtt/mqtt-init-parallel.sh

@@ -21,12 +21,20 @@ registerTopic () {
         -u "$MQTT_USERNAME" \
         -P "$MQTT_PASSWORD" \
         -i $MQTT_CLIENTID \
+        -r \
         -t "$MQTT_TOPIC/sensor/${device_name}_$2/config" \
         -m "{
             \"name\": \"${device_name}_$2\",
             \"unit_of_measurement\": \"$3\",
             \"state_topic\": \"$MQTT_TOPIC/sensor/${device_name}_$2\",
-            \"icon\": \"mdi:$4\"
+            \"icon\": \"mdi:$4\",
+            \"unique_id\": \"${device_name}_$2\",
+            \"device\": {
+                \"identifiers\": [\"${device_name}\"],
+                \"name\": \"${device_name}\",
+                \"manufacturer\": \"Voltronic\",
+                \"model\": \"Parallel Inverter #${inv_id}\"
+            }
         }"
 }
 
@@ -40,10 +48,20 @@ registerInverterRawCMD () {
         -u "$MQTT_USERNAME" \
         -P "$MQTT_PASSWORD" \
         -i $MQTT_CLIENTID \
-        -t "$MQTT_TOPIC/sensor/$device_name/config" \
+        -r \
+        -t "$MQTT_TOPIC/sensor/${device_name}_raw_cmd/config" \
         -m "{
-            \"name\": \"$device_name\",
-            \"state_topic\": \"$MQTT_TOPIC/sensor/$device_name\"
+            \"name\": \"${device_name} Raw Command\",
+            \"state_topic\": \"$MQTT_TOPIC/sensor/${device_name}_raw_cmd\",
+            \"command_topic\": \"$MQTT_TOPIC/sensor/${device_name}_raw_cmd/command\",
+            \"unique_id\": \"${device_name}_raw_cmd\",
+            \"icon\": \"mdi:console\",
+            \"device\": {
+                \"identifiers\": [\"${device_name}\"],
+                \"name\": \"${device_name}\",
+                \"manufacturer\": \"Voltronic\",
+                \"model\": \"Parallel Inverter #${inv_id}\"
+            }
         }"
 }