Phase 4/5: host demos via Apache container behind Caddy

deploy/smb-demos: compose + runbook for the static demo host
(httpd on the proxy network, routed by Caddy at demos.mivanchenko.de).
Pending a DNS A record before Caddy can issue TLS.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

deploy/smb-demos/docker-compose.yml

@@ -0,0 +1,17 @@
+# Static demo landing pages, served by Apache on the homelab host.
+# Lives at /home/mivanchenko/smb-demos on the server; site/ is templates/landing/.
+# Routed by Caddy: demos.mivanchenko.de { reverse_proxy smb-demos:80 }
+# Requires a DNS A record demos.mivanchenko.de -> 188.193.49.3 (no wildcard DNS).
+services:
+  smb-demos:
+    image: httpd:2.4-alpine
+    container_name: smb-demos
+    restart: always
+    volumes:
+      - ./site:/usr/local/apache2/htdocs:ro
+    networks:
+      - proxy
+
+networks:
+  proxy:
+    external: true