Rules read as a direction

A match's zones are written "lan → wan" (or "any but wan → any", and
"lan → firewall" / "firewall → wan" in the input and output chains)
instead of "in lan · out wan" and "in not wan"; exclusions read "from
any but X". The Rules and NAT pages and hc; flags and JSON unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -76,6 +76,15 @@ All notable changes to Housecarl are documented here. The format follows
 - Import: sets with `flags timeout` become dynamic sets; a DNAT of
   several ports becomes one port forward per port.
 
+### Changed
+
+- **Rules read as a direction.** A match's zones are written `lan → wan`,
+  `any but wan → any`, or with the firewall itself as the other end
+  (`lan → firewall` in input, `firewall → wan` in output), instead of
+  `in lan · out wan` and `in not wan`; exclusions read `from any but X`.
+  On the Rules and NAT pages and in `hc`; the flags and JSON stay as
+  they were.
+
 ### Fixed
 
 - `hc stats top devices` listed each device twice (once for what it