feat: deprecate email, pre-verify users + documentation

backend/apps/accounts/models.py

@@ -71,8 +71,18 @@ class User(AbstractBaseUser, PermissionsMixin):
             ),
         ]
 
+    @property
+    def display_name(self) -> str:
+        first = (self.first_name or "").strip()
+        last = (self.last_name or "").strip()
+        if first or last:
+            return f"{first} {last}".strip()
+        if self.email:
+            return self.email
+        return self.phone_number
+
     def __str__(self):
-        return self.email or self.phone_number or str(self.id)
+        return self.display_name
 
 
 class OtpChannel(models.TextChoices):