fix: UDP插件改用 conn.SetDeadline 替代类型断言

plugins/services/snmp.go

@@ -75,9 +75,7 @@ func (p *SNMPPlugin) probe(ctx context.Context, target, community string, timeou
 	}
 	defer conn.Close()
 
-	if dl, ok := conn.(interface{ SetReadDeadline(time.Time) error }); ok {
-		_ = dl.SetReadDeadline(time.Now().Add(timeout))
-	}
+	_ = conn.SetDeadline(time.Now().Add(timeout))
 
 	pkt := buildSNMPGetRequest(community, []int{1, 3, 6, 1, 2, 1, 1, 1, 0})
 	if _, err := conn.Write(pkt); err != nil {