config: wire TempSensor section from config.json to TempSensorSim

PlantFactory.create() now accepts sensor_config dict; extracts type and
kwargs, falls back to sigma=0.05/temp_offset=-0.15 defaults. brewpi.py
passes config.get('TempSensor', {}). Templates updated with full
TempSensor sections.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

config-real.json.tpl

@@ -1,7 +1,6 @@
 {
 	"ambient_temperature": 20,
 	"Controller" : {
-	"stirrer_name": "pololu1376",
 	"plant_name": "real",
 	"pid_type": "Smith"
 	},
@@ -35,11 +34,17 @@
 		}
 	},
 	"Heater": {
+	    "type": "hendi",
 		"port": "/dev/ttyUSB0",
 		"speed": "115200"
 	},
 	"Stirrer": {
+	    "type": "pololu1376",
 		"port": "/dev/ttyACM0",
 		"speed": "115200"
+	},
+	"TempSensor": {
+	    "type": "max31865",
+		"temp_offset": -0.15
 	}
 }