Fix TypeError in AC power calculation

pv_power is a dict with keys 'pv1', 'pv2', 'pv3', 'total', but was
being added directly to battery_power (float). Changed to use
pv_power['total'] for AC power calculation.

Fixes: TypeError: unsupported operand type(s) for +: 'dict' and 'float'

Author: claude

emulator/simulator.py

@@ -106,7 +106,7 @@ def update(self) -> None:
         grid_power = self._calculate_grid_power(pv_power, battery_power)
 
         # Calculate AC output
-        ac_power = pv_power + battery_power  # Total output to grid/load
+        ac_power = pv_power['total'] + battery_power  # Total output to grid/load
 
         # Calculate temperatures
         temps = self._calculate_temperatures(ac_power)