feat: Flusso completo discovery parallelo per 2 inverter

FLUSSO IMPLEMENTATO:
1. All'avvio: registra discovery topics per 2 inverter (hardcoded)
2. Discovery topics ripetuti ogni 5 minuti (invece di 10)
3. Parallel discovery parametri con retry:
   - Tenta discovery fino a 3 volte
   - Se fallisce: attende 5s e riprova
   - Se tutti i tentativi falliscono: assume 2 inverter
4. Estrazione dati ogni 30s per entrambi gli inverter

NAMING:
- Inverter 1: voltronic_inv1_*
- Inverter 2: voltronic_inv2_*

Discovery topics include tutti i 33 parametri per entrambi gli inverter

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

@@ -68,20 +68,37 @@ pushInfluxData () {
     curl -i -XPOST "$INFLUX_HOST/write?db=$INFLUX_DATABASE&precision=s" -u "$INFLUX_USERNAME:$INFLUX_PASSWORD" --data-binary "$INFLUX_PREFIX,device=${INFLUX_DEVICE}_inv${1} $INFLUX_MEASUREMENT_NAME=$3" > /dev/null 2>&1
 }
 
-# Discover parallel inverters
+# Discover parallel inverters with retry logic
 SUDO_CMD=""
 if [ "$EUID" -ne 0 ] && [ -c "/dev/ttyUSB0" ]; then
     SUDO_CMD="sudo"
 fi
 
-PARALLEL_DISCOVERY=`$SUDO_CMD "$INVERTER_BIN" -p 2>&1`
-PARALLEL_COUNT=`echo "$PARALLEL_DISCOVERY" | grep "PARALLEL_COUNT=" | cut -d= -f2`
+# Try parallel discovery with retry
+MAX_RETRIES=3
+RETRY_DELAY=5
+PARALLEL_COUNT=0
 
-echo "Parallel discovery: count=$PARALLEL_COUNT"
+for attempt in $(seq 1 $MAX_RETRIES); do
+    echo "Parallel discovery attempt $attempt/$MAX_RETRIES..."
+    PARALLEL_DISCOVERY=`$SUDO_CMD "$INVERTER_BIN" -p 2>&1`
+    PARALLEL_COUNT=`echo "$PARALLEL_DISCOVERY" | grep "PARALLEL_COUNT=" | cut -d= -f2`
+    
+    if [ ! -z "$PARALLEL_COUNT" ] && [ "$PARALLEL_COUNT" -gt 0 ]; then
+        echo "✓ Found $PARALLEL_COUNT inverters"
+        break
+    else
+        echo "⚠ Discovery failed (count=$PARALLEL_COUNT)"
+        if [ $attempt -lt $MAX_RETRIES ]; then
+            echo "  Waiting ${RETRY_DELAY}s before retry..."
+            sleep $RETRY_DELAY
+        fi
+    fi
+done
 
-# If no parallel count detected, assume 2 inverters
+# If still no count, assume 2 inverters
 if [ -z "$PARALLEL_COUNT" ] || [ "$PARALLEL_COUNT" -eq 0 ]; then
-    echo "⚠ No parallel count detected, assuming 2 inverters"
+    echo "⚠ All discovery attempts failed, assuming 2 inverters"
     PARALLEL_COUNT=2
 fi