fix(services): conditional caddy_net across all Docker service scripts

Only include the caddy_net network block in generated docker-compose.yml
files when ~/docker/caddy exists. Prevents "network caddy_net declared
as external, but could not be found" on standalone installs without Caddy.

Affected: actualbudget, archivebox, arm, audiobookshelf, calibre-web,
changedetection, drum-rhythm-game, emby, fmd, frigate, frigate-audio,
frigate-notify, gatus, homeassistant, immich, iopaint, jellyfin, joplin,
koha, lyrion, magicmirror, mail-archiver, mattermost, mealie, meshcentral,
n8n, nextcloud, ntfy, onlyoffice, portainer, stirling-pdf, syncthing,
traccar, unifi, uptimekuma, vaultwarden, wg-easy

Skipped: authelia (creates caddy_net itself), caddy, crowdsec, wolf,
wolf-pair, and services using network_mode: host with no caddy_net.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01D8ckUJQtj1pH8jtAddBDZs

services/homeassistant.sh

@@ -218,11 +218,25 @@ install_homeassistant() {
     else
         HA_NET_LINES="    ports:
       - \"8123:8123\""
-        HA_CADDY_NET_LINES="    networks:
+        if [ -d "$DOCKER_DIR/caddy" ]; then
+            HA_CADDY_NET_LINES="    networks:
       - caddy_net"
+        else
+            HA_CADDY_NET_LINES=""
+        fi
         echo "  → Bridge networking selected (port 8123 published)."
     fi
 
+    local _CADDY_NET_SECTION=""
+    if [ "$HA_NETMODE" != "2" ] && [ -d "$DOCKER_DIR/caddy" ]; then
+        _CADDY_NET_SECTION="
+networks:
+  caddy_net:
+    external: true
+    name: ${SITE_CADDY_NET:-caddy_net}
+"
+    fi
+
     cat > docker-compose.yml << HOMEASSISTANT_COMPOSE
 name: homeassistant
 
@@ -240,11 +254,7 @@ services:
       - /run/dbus:/run/dbus:ro
 ${HA_NET_LINES}
 ${HA_CADDY_NET_LINES}
-
-networks:
-  caddy_net:
-    external: true
-    name: \${CADDY_NET:-caddy_net}
+${_CADDY_NET_SECTION}
 HOMEASSISTANT_COMPOSE
 
     mkdir -p config