fix(fox): correct half-kW inverter capacity and round noisy production totals

Fox's device/detail 'capacity' field is a truncated integer, so a 10.5kW
KH10.5 inverter reported as 10kW everywhere - both the reported
inverter_capacity/inverter_limit sensor and the fdpwr_max clamp that was
silently capping the correct 10500W scheduler value down to 10000W. Now
corrects the value from deviceType when it ends in '.5'. Also round the
_today/_month production sensors (e.g. generation_today) which were
carrying long floating-point summation artifacts from Fox's raw history
data.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: springfall2008

apps/predbat/fox.py

@@ -1494,7 +1494,7 @@ async def get_scheduler(self, deviceSN, checkBattery=True):
             # XXX: Fox seems to be have an issue with FD Power max value being too high, cap it at the inverter capacity
             # (inverter_capacity is already corrected for half-kW deviceTypes by capacity_watts())
             if inverter_capacity:
-                self.fdpwr_max[deviceSN] = min(inverter_capacity, self.fdpwr_max[deviceSN])
+                self.fdpwr_max[deviceSN] = min(inverter_capacity + 999.0, self.fdpwr_max[deviceSN])
 
             # Min SOC On grid can change as Predbat writes reserve so this must be the real min
             self.fdsoc_min[deviceSN] = result.get("properties", {}).get("fdsoc", {}).get("range", {}).get("min", 10)