Refactor and enhance device management and authentication features

- Updated the `reverse_dhivehi_string` function to correct the range for combining characters.
- Added new device handling in the health check view and integrated the `add_new_devices_to_omada` task.
- Improved date handling in `CreateTemporaryUserView` to ensure proper string conversion.
- Enhanced OTP sending by converting mobile numbers to strings.
- Implemented MAC address validation in the `Device` model using a custom validator.
- Removed unnecessary fields from the `CreateDeviceSerializer`.
- Normalized MAC address format in the `DeviceListCreateAPIView`.
- Updated the `djangopasswordlessknox` package to improve code consistency and readability.
- Added migration to enforce MAC address validation in the database.

devices/models.py

@@ -1,11 +1,26 @@
 from django.db import models
 from django.utils import timezone
 from api.models import User
+import regex
+from django.core.exceptions import ValidationError
+
+
+def validate_mac_address(value):
+    if not regex.match(r"^([0-9A-Fa-f]{2}-){5}[0-9A-Fa-f]{2}$", value):
+        raise ValidationError(
+            "This field accepts a valid MAC address in the format XX-XX-XX-XX-XX-XX using '-' as the separator."
+        )
+    return value
 
 
 class Device(models.Model):
     name = models.CharField(max_length=255)
-    mac = models.CharField(max_length=255)
+    mac = models.CharField(
+        max_length=255,
+        validators=[
+            validate_mac_address,
+        ],
+    )
     has_a_pending_payment = models.BooleanField(default=False)
     reason_for_blocking = models.CharField(max_length=255, null=True, blank=True)
     is_active = models.BooleanField(default=False)