fix: update ethertype_from_int and protocol_from_number to return string names for better compatibility

backend/src/Models/ip_protocol.py

@@ -1,4 +1,5 @@
 from enum import Enum
+from typing import Literal
 
 """
 This module defines an enumeration for IP protocol types and provides a mapping
@@ -310,6 +311,6 @@ IP_PROTOCOL_MAP = {
     255: IPProtocolEnum.RESERVED,
 }
 
-def protocol_from_number(n: int) -> IPProtocolEnum:
-    return IP_PROTOCOL_MAP.get(n, IPProtocolEnum.UNKNOWN)
+def protocol_from_number(n: int) -> str:
+    return IP_PROTOCOL_MAP.get(n, IPProtocolEnum.UNKNOWN).name