Add sensor_fixes package for CO2 unit workaround

Use customize to set unit_of_measurement for Govee H5140 CO2 sensor.
HA still logs a validation warning but the unit displays correctly.

Workaround until 1technophile/OpenMQTTGateway#2279 is merged and released.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: bafulton

kubernetes/apps/home-assistant/files/packages/sensor_fixes.yaml

@@ -5,5 +5,6 @@ homeassistant:
   customize:
     # Fix missing unit_of_measurement for Govee H5140 CO2 sensor
     # Workaround until 1technophile/OpenMQTTGateway#2279 is released
+    # Note: HA still logs a warning but the unit displays correctly
     sensor.co2:
       unit_of_measurement: "ppm"