Merge pull request 'chore: version-control the WHMCS KB redirect rules' (#10) from chore/save-whmcs-redirects into main

deploy/README.md

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+# Deploy artefacts
+
+Config that lives on other servers but belongs under version control here,
+because it exists to serve this KB.
+
+## `whmcs-kb-redirects.conf`
+
+301 redirects that send the retired WHMCS knowledgebase
+(`secure.anhonesthost.com/knowledgebase/*`) to its replacement pages on
+kb.anhonesthost.com. Installed 2026-08-01.
+
+**Where it lives in production:** `/home/whmcs/public_html/.htaccess` on
+`secure.anhonesthost.com`, prepended **before** the
+`### BEGIN - WHMCS managed rules ###` marker. It has to come first — WHMCS's
+own block ends with a catch-all that routes everything to `index.php`, so
+rules placed after it never run.
+
+The canonical copy on that server is `/root/kb-redirects.conf`, and the
+pre-migration `.htaccess` is backed up at
+`/root/htaccess-backup-20260801.bak`.
+
+### Reinstalling
+
+WHMCS rewrites `.htaccess` during some updates, which will silently drop
+these rules. To restore:
+
+```bash
+cd /home/whmcs/public_html
+cp -a .htaccess /root/htaccess-backup-$(date +%Y%m%d).bak   # keep whatever WHMCS wrote
+cat /root/kb-redirects.conf /root/htaccess-backup-$(date +%Y%m%d).bak > /tmp/htaccess.new
+install -o whmcs -g whmcs -m 644 /tmp/htaccess.new .htaccess
+apachectl -t
+```
+
+Then spot-check a redirect:
+
+```bash
+curl -sI https://secure.anhonesthost.com/knowledgebase/13/x.html | grep -i location
+# expect: https://kb.anhonesthost.com/support/remote-support/
+```
+
+### Two things that will bite you when editing it
+
+**Article and category IDs collide.** Both use the shape
+`/knowledgebase/<id>/<slug>`, and the same number means different things —
+article 5 is "What are my Name Servers?", category 5 is "WordPress Specific".
+The *only* discriminator is the trailing `.html` on articles. That's why every
+article rule appears before every category rule and terminates with `[L]`: by
+the time the broad category patterns run, anything ending `.html` is already
+gone. Reordering the file breaks this silently, and the wrong page still
+returns 200.
+
+**The slug is ignored.** WHMCS reads only the id, so any slug with the right
+id resolves. The rules match `[^/]*` for the slug for the same reason.
+
+Legacy pre-SEO URLs (`knowledgebase.php?action=displayarticle&id=N` and
+`?action=displaycat&catid=N`) are mapped explicitly. `(^|&)id=` cannot match
+`catid=` — the preceding character is `t`, not `&` or start-of-string — so the
+two sets can't cross-fire.

deploy/whmcs-kb-redirects.conf

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+### BEGIN - KB migration redirects to kb.anhonesthost.com ###
+# Added 2026-08-01. The WHMCS knowledgebase is retired; these 301s send its
+# URLs to the equivalent page on the dedicated KB.
+#
+# ORDER MATTERS. Article and category URLs share the shape
+#   /knowledgebase/<id>/<slug>
+# and their IDs COLLIDE (article 5 is "What are my Name Servers?", category 5
+# is "WordPress Specific"). The only discriminator is the trailing ".html" on
+# articles. Article rules therefore come first and terminate with [L]; the
+# category rules below can then match broadly because anything ending .html
+# has already been redirected and will never reach them.
+#
+# The slug is ignored by WHMCS (only the id is read), so it is ignored here
+# too — any slug with the right id resolves to the right destination.
+#
+# The trailing "?" on each target discards the inbound query string.
+<IfModule mod_rewrite.c>
+RewriteEngine on
+RewriteBase /
+
+# --- Articles (.html) -------------------------------------------------
+RewriteRule ^knowledgebase/2/[^/]*\.html$  https://kb.anhonesthost.com/email/set-up-your-email-client/? [R=301,L]
+RewriteRule ^knowledgebase/3/[^/]*\.html$  https://kb.anhonesthost.com/email/set-up-your-email-client/? [R=301,L]
+RewriteRule ^knowledgebase/4/[^/]*\.html$  https://kb.anhonesthost.com/email/spam-filtering-changes/? [R=301,L]
+RewriteRule ^knowledgebase/5/[^/]*\.html$  https://kb.anhonesthost.com/cpanel/nameservers/? [R=301,L]
+RewriteRule ^knowledgebase/6/[^/]*\.html$  https://kb.anhonesthost.com/cpanel/fix-a-403-error/? [R=301,L]
+RewriteRule ^knowledgebase/7/[^/]*\.html$  https://kb.anhonesthost.com/cpanel/wordpress-email-from-your-domain/? [R=301,L]
+RewriteRule ^knowledgebase/8/[^/]*\.html$  https://kb.anhonesthost.com/cpanel/free-ssl-certificate/? [R=301,L]
+RewriteRule ^knowledgebase/9/[^/]*\.html$  https://kb.anhonesthost.com/email/set-up-your-email-client/? [R=301,L]
+RewriteRule ^knowledgebase/10/[^/]*\.html$ https://kb.anhonesthost.com/domains/transferring-a-domain-to-us/? [R=301,L]
+RewriteRule ^knowledgebase/11/[^/]*\.html$ https://kb.anhonesthost.com/domains/transferring-a-domain-to-us/? [R=301,L]
+RewriteRule ^knowledgebase/12/[^/]*\.html$ https://kb.anhonesthost.com/domains/flush-your-dns-cache/? [R=301,L]
+RewriteRule ^knowledgebase/13/[^/]*\.html$ https://kb.anhonesthost.com/support/remote-support/? [R=301,L]
+RewriteRule ^knowledgebase/14/[^/]*\.html$ https://kb.anhonesthost.com/whp/getting-started/welcome/? [R=301,L]
+
+# --- Categories (no .html) --------------------------------------------
+RewriteRule ^knowledgebase/2/[^/]*/?$ https://kb.anhonesthost.com/email/set-up-your-email-client/? [R=301,L]
+RewriteRule ^knowledgebase/3/[^/]*/?$ https://kb.anhonesthost.com/email/spam-filtering-changes/? [R=301,L]
+RewriteRule ^knowledgebase/4/[^/]*/?$ https://kb.anhonesthost.com/cpanel/nameservers/? [R=301,L]
+RewriteRule ^knowledgebase/5/[^/]*/?$ https://kb.anhonesthost.com/cpanel/wordpress-email-from-your-domain/? [R=301,L]
+RewriteRule ^knowledgebase/6/[^/]*/?$ https://kb.anhonesthost.com/domains/transferring-a-domain-to-us/? [R=301,L]
+RewriteRule ^knowledgebase/7/[^/]*/?$ https://kb.anhonesthost.com/cpanel/fix-a-403-error/? [R=301,L]
+RewriteRule ^knowledgebase/8/[^/]*/?$ https://kb.anhonesthost.com/support/remote-support/? [R=301,L]
+RewriteRule ^knowledgebase/9/[^/]*/?$ https://kb.anhonesthost.com/whp/getting-started/welcome/? [R=301,L]
+
+# --- Legacy query-string URLs -----------------------------------------
+# Pre-SEO-URL links still in old tickets and emails:
+#   knowledgebase.php?action=displayarticle&id=<id>
+#   knowledgebase.php?action=displaycat&catid=<id>
+# WHMCS used to 301 these to the friendly URL itself, but our rules above
+# now intercept first — so map them explicitly or they all land on the KB
+# home page and lose their destination.
+#
+# "(^|&)id=" cannot match "catid=" (the preceding char is "t", not & or
+# start-of-string), so the two sets can't cross-fire.
+RewriteCond %{QUERY_STRING} (^|&)id=2(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/email/set-up-your-email-client/? [R=301,L]
+RewriteCond %{QUERY_STRING} (^|&)id=3(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/email/set-up-your-email-client/? [R=301,L]
+RewriteCond %{QUERY_STRING} (^|&)id=4(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/email/spam-filtering-changes/? [R=301,L]
+RewriteCond %{QUERY_STRING} (^|&)id=5(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/cpanel/nameservers/? [R=301,L]
+RewriteCond %{QUERY_STRING} (^|&)id=6(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/cpanel/fix-a-403-error/? [R=301,L]
+RewriteCond %{QUERY_STRING} (^|&)id=7(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/cpanel/wordpress-email-from-your-domain/? [R=301,L]
+RewriteCond %{QUERY_STRING} (^|&)id=8(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/cpanel/free-ssl-certificate/? [R=301,L]
+RewriteCond %{QUERY_STRING} (^|&)id=9(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/email/set-up-your-email-client/? [R=301,L]
+RewriteCond %{QUERY_STRING} (^|&)id=10(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/domains/transferring-a-domain-to-us/? [R=301,L]
+RewriteCond %{QUERY_STRING} (^|&)id=11(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/domains/transferring-a-domain-to-us/? [R=301,L]
+RewriteCond %{QUERY_STRING} (^|&)id=12(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/domains/flush-your-dns-cache/? [R=301,L]
+RewriteCond %{QUERY_STRING} (^|&)id=13(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/support/remote-support/? [R=301,L]
+RewriteCond %{QUERY_STRING} (^|&)id=14(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/whp/getting-started/welcome/? [R=301,L]
+
+RewriteCond %{QUERY_STRING} (^|&)catid=2(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/email/set-up-your-email-client/? [R=301,L]
+RewriteCond %{QUERY_STRING} (^|&)catid=3(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/email/spam-filtering-changes/? [R=301,L]
+RewriteCond %{QUERY_STRING} (^|&)catid=4(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/cpanel/nameservers/? [R=301,L]
+RewriteCond %{QUERY_STRING} (^|&)catid=5(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/cpanel/wordpress-email-from-your-domain/? [R=301,L]
+RewriteCond %{QUERY_STRING} (^|&)catid=6(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/domains/transferring-a-domain-to-us/? [R=301,L]
+RewriteCond %{QUERY_STRING} (^|&)catid=7(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/cpanel/fix-a-403-error/? [R=301,L]
+RewriteCond %{QUERY_STRING} (^|&)catid=8(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/support/remote-support/? [R=301,L]
+RewriteCond %{QUERY_STRING} (^|&)catid=9(&|$)
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/whp/getting-started/welcome/? [R=301,L]
+
+# --- Tags, search, index, and anything else under /knowledgebase ------
+# Catch-all last: any KB URL not matched above lands on the KB home page
+# rather than a WHMCS 404.
+RewriteRule ^knowledgebase\.php$ https://kb.anhonesthost.com/? [R=301,L]
+RewriteRule ^knowledgebase(/.*)?$ https://kb.anhonesthost.com/? [R=301,L]
+</IfModule>
+### END - KB migration redirects to kb.anhonesthost.com ###
+