statd: add pwm fan support

Due to their nature we cannot read out the RPM of the pwm fans on the
BPi-R3.  But we can at least show it's alive, or steering out a signal
to the fan.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/statd/python/cli_pretty/cli_pretty.py

@@ -652,7 +652,20 @@ class Sensor:
             else:
                 return f"{self.value} W"
 
+        # Handle PWM fan sensors (reported as "other" type with milli scale)
+        # PWM duty cycle is reported as percentage (0-100)
+        elif self.value_type == 'other' and self.value_scale == 'milli':
+            # Check if this is likely a PWM sensor based on description or name
+            name_lower = self.name.lower()
+            desc_lower = (self.description or "").lower()
+            if 'pwm' in desc_lower or 'fan' in name_lower or 'fan' in desc_lower:
+                percent = self.value / 1000.0
+                return f"{percent:.1f}%"
+            # Fall through for other "other" type sensors
+
         # For unknown sensor types, show raw value
+        if self.value_type in ['other', 'unknown']:
+            return f"{self.value}"
         else:
             return f"{self.value} {self.value_type}"