Add PSU voltage sensors with 220V range highlighting

internal/server/handlers.go

@@ -268,7 +268,42 @@ func (s *Server) handleGetSensors(w http.ResponseWriter, r *http.Request) {
 		jsonResponse(w, []interface{}{})
 		return
 	}
-	jsonResponse(w, result.Sensors)
+	sensors := append([]models.SensorReading{}, result.Sensors...)
+	sensors = append(sensors, synthesizePSUVoltageSensors(result.Hardware)...)
+	jsonResponse(w, sensors)
+}
+
+func synthesizePSUVoltageSensors(hw *models.HardwareConfig) []models.SensorReading {
+	if hw == nil || len(hw.PowerSupply) == 0 {
+		return nil
+	}
+	const (
+		nominalV = 220.0
+		minV     = nominalV * 0.9 // 198V
+		maxV     = nominalV * 1.1 // 242V
+	)
+	out := make([]models.SensorReading, 0, len(hw.PowerSupply))
+	for _, psu := range hw.PowerSupply {
+		if psu.InputVoltage <= 0 {
+			continue
+		}
+		name := "PSU " + strings.TrimSpace(psu.Slot) + " input voltage"
+		if strings.TrimSpace(psu.Slot) == "" {
+			name = "PSU input voltage"
+		}
+		status := "ok"
+		if psu.InputVoltage < minV || psu.InputVoltage > maxV {
+			status = "warn"
+		}
+		out = append(out, models.SensorReading{
+			Name:   name,
+			Type:   "voltage",
+			Value:  psu.InputVoltage,
+			Unit:   "V",
+			Status: status,
+		})
+	}
+	return out
 }
 
 func (s *Server) handleGetConfig(w http.ResponseWriter, r *http.Request) {