Enhance UPS host display with location and IP address

ups_management/ups_manager/models.py

@@ -49,9 +49,12 @@ class UPSHost(models.Model):
         return sum(battery.quantity for battery in self.battery_set.all())
 
     def __str__(self):
+        parts = [f'{self.brand} {self.model}']
+        if self.location:
+            parts.append(f'[{self.location}]')
         if self.ip_address and not self.ip_address.startswith('-'):
-            return f'{self.brand} {self.model} - {self.ip_address}'
-        return f'{self.brand} {self.model}'
+            parts.append(f'({self.ip_address})')
+        return ' '.join(parts)
 
     class Meta:
         verbose_name = 'UPS主机'