Add ASN-domain aliases to base_reverse_dns_map.csv (#712)

* Add ASN-domain aliases to base_reverse_dns_map.csv

Adds 457 entries keyed on the `as_domain` values that ship in
`ipinfo_lite.mmdb`, so that the existing reverse_dns_map can serve as
a lookup table for IPs that resolve no PTR — the common case for many
large senders.

Before this change only ~33.8% of routed IPv4 space had an `as_domain`
that matched a map key; after, ~84.0%. All additions are brands that
were already represented in the map under a different rDNS-base key
(e.g. `comcast.com` alongside the existing `comcast.net`), plus a
handful of well-known operators that previously had no representation
at all.

Also promotes 10 entries out of known_unknown_base_reverse_dns.txt
(a1.net, actcorp.in, ais.co.th, emirates.net.ae, eolo.it, fpt.vn,
ibm.com, movilnet.com.ve, ote.gr, singnet.com.sg) — each is a
well-known operator whose identity is unambiguous from ASN context
even if the original rDNS base alone was inconclusive.

No code changes; this is purely data, in preparation for a follow-up
that wires `as_domain` into the source-attribution fallback path when
a report row has no reverse DNS.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* Reclassify Zscaler as SaaS

Zscaler is consumed as a self-service security platform, not delivered
as a managed service, so SaaS fits better than MSSP.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Sean Whalen <seanthegeek@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

parsedmarc/resources/maps/known_unknown_base_reverse_dns.txt

@@ -39,7 +39,6 @@
 999lakeshore.com
 999servers.com
 9services.com
-a1.net
 a2-cross.asia
 a2telecomfibra.com.br
 a2u2.com
@@ -83,7 +82,6 @@ acinternet.net.br
 acquatelecom.com.br
 acrsolutions.com
 actcapitaledge.com
-actcorp.in
 activaicon.com
 active-ns.com
 activelifemedical.com
@@ -130,7 +128,6 @@ airsystem33.com
 airtel.cd
 airtel.net
 airyhosting.com
-ais.co.th
 aistechsolutions.com
 ajorealestate.com
 ak888.ru
@@ -1015,7 +1012,6 @@ emeraldonion.net
 emergencyjacket.online
 emergingmarketsreview.com
 emexinternet.com.br
-emirates.net.ae
 emk.ru
 emsgateway.net
 energain.com.mx
@@ -1031,7 +1027,6 @@ entelpcs.cl
 entendercopilot.com
 enticingofdisadvantage.com
 entretothom.net
-eolo.it
 epaycontrol.com
 epbnet.com
 epectelco.com.ar
@@ -1206,7 +1201,6 @@ foxinfo.net.br
 foxitsign.com
 foxnew.de
 foxtelecominformatica.com.br
-fpt.vn
 francecanterbury.com
 franet.com.br
 frauen-online.net
@@ -1525,7 +1519,6 @@ iam.net.ma
 iasys-sg.com
 ib.systems
 iblock.net
-ibm.com
 ibrexres.com
 ibys.com.br
 iccnet.cm
@@ -2134,7 +2127,6 @@ motion4ever.net
 motivationpotion.com
 mottanet.net.br
 mov.pro.br
-movilnet.com.ve
 movinet.com.uy
 movtelecom.net.br
 mpirelease.com
@@ -2439,7 +2431,6 @@ ospepm.cn
 oss-core.com
 oss-core.net
 otccatering.com
-ote.gr
 otmprint.com
 ourhosted.com
 ourinet.com.br
@@ -2894,7 +2885,6 @@ simonmosheshvili.com
 simplediagnostics.org
 simtelecomms.com.br
 sincroniza.net.br
-singnet.com.sg
 sion.net
 siriuscloud.jp
 sisglobalresearch.com