fix: move newsfeed-api off 8081 to 22672 (conflict-unlikely port)

8081 is the alt-HTTP port — one of the crowded defaults every proxy/dev server
grabs — so it's collision-prone on a shared host. Move to 22672, a registered-
range port in the sparse 20000s band, derived deterministically from the
service name and recorded in architecture port-allocations.md.

Updated everywhere the number appears: api bind config + default, firewalld
service XML, nginx upstream, vite dev proxy, deploy workflow API_PORT,
infra-setup (SELinux semanage label), and docs.

Operator note: re-run script/infra-setup.sh on slartibartfast to relabel the
SELinux port (22672) and ship the updated firewalld XML before the next deploy
restarts the api on the new port.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016fKZzDpvjiJ9eYbPGgJvUP

asset/config/config.toml.tmpl

@@ -7,7 +7,7 @@
 
 # Bind the mesh-routable address so the oolon proxy can reach it. firewalld
 # (newsfeed-api service) bounds who may connect; TLS terminates at oolon.
-bind = "0.0.0.0:8081"
+bind = "0.0.0.0:22672"
 
 database_path = "/var/lib/newsfeed/newsfeed.db"
 session_ttl_days = 30

asset/firewalld/newsfeed-api.xml

@@ -3,5 +3,5 @@
   <short>newsfeed-api</short>
   <description>newsfeed REST/JSON API. Reached over the WireGuard mesh by the oolon edge
   proxy, which terminates TLS and reverse-proxies to this port.</description>
-  <port protocol="tcp" port="8081"/>
+  <port protocol="tcp" port="22672"/>
 </service>

asset/nginx/newsfeed.internal.conf

@@ -7,7 +7,7 @@
 #   ln -sf ../sites-available/newsfeed.internal.conf /etc/nginx/sites-enabled/
 
 upstream newsfeed_api {
-    server slartibartfast.kosherinata.internal:8081;
+    server slartibartfast.kosherinata.internal:22672;
     keepalive 16;
 }