Fix network collector float-to-int cast for interface speed and MTU

NAPALM can return speed/mtu as floats, but the Diode SDK expects integers.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

collectors/network_collector.py

@@ -1052,8 +1052,8 @@ def build_interface_entities(interfaces: dict, hostname: str, model: str,
             name=name,
             type=iface_type,
             enabled=iface_data.get("is_enabled", True),
-            mtu=iface_data.get("mtu") or 0,
-            speed=speed * 1000 if speed else 0,  # NAPALM Mbps → NetBox Kbps
+            mtu=int(iface_data.get("mtu") or 0),
+            speed=int(speed * 1000) if speed else 0,  # NAPALM Mbps → NetBox Kbps
             description=iface_data.get("description") or "",
             tags=["network-collector"],
         )