feat: Forza modalità parallela con default 2 inverter

- Rimosso timeout e detection automatica
- Sempre modalità parallela forzata
- Default 2 inverter se parallel discovery fallisce
- Registra discovery per voltronic_inv1 e voltronic_inv2

NOTA: Se gli inverter non rispondono a QPGS, NON sono in modalità parallela.
Per gestire 2 inverter fisici separati, serve INVERTER_DEVICES=/dev/ttyUSB0:/dev/ttyUSB1

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

@@ -77,21 +77,15 @@ fi
 PARALLEL_DISCOVERY=`$SUDO_CMD "$INVERTER_BIN" -p 2>&1`
 PARALLEL_COUNT=`echo "$PARALLEL_DISCOVERY" | grep "PARALLEL_COUNT=" | cut -d= -f2`
 
+echo "Parallel discovery: count=$PARALLEL_COUNT"
+
+# If no parallel count detected, assume 2 inverters
 if [ -z "$PARALLEL_COUNT" ] || [ "$PARALLEL_COUNT" -eq 0 ]; then
-    echo "No parallel inverters found (count=$PARALLEL_COUNT), using standard polling"
-    # Don't use fallback in dev mode if file doesn't exist
-    if [ -f "$MQTT_FALLBACK" ]; then
-        exec $MQTT_FALLBACK
-    else
-        echo "Fallback script not found: $MQTT_FALLBACK"
-        echo "Using standard inverter_poller -1 instead"
-        INVERTER_DATA=`$SUDO_CMD "$INVERTER_BIN" -1 2>&1`
-        echo "$INVERTER_DATA"
-    fi
-    exit 0
+    echo "⚠ No parallel count detected, assuming 2 inverters"
+    PARALLEL_COUNT=2
 fi
 
-echo "Found $PARALLEL_COUNT parallel inverters"
+echo "Processing $PARALLEL_COUNT parallel inverters"
 
 # Publish discovery info
 pushMQTTData "system" "parallel_count" "$PARALLEL_COUNT"