fix: restore app reachability after platform restart

Two root causes:

1. Caddy was started without --resume, so every restart wiped all
   dynamically-registered app routes (only the base Caddyfile survived).
   Adding --resume makes Caddy reload its auto-saved config (stored in
   the caddy-config volume) which includes all app routes.

2. App routes used the container IP address, which changes whenever
   hiy-net is torn down and recreated by compose. Switch to the
   container name as the upstream dial address; Podman's aardvark-dns
   resolves it by name within hiy-net, so it stays valid across
   network recreations.

Together with the existing reconnect loop in start.sh these two
changes mean deployed apps survive a platform restart without needing
a redeploy.

https://claude.ai/code/session_01FKCW3FDjNFj6jve4niMFXH

builder/build.sh

@@ -113,9 +113,7 @@ CADDY_API="${CADDY_API_URL:-http://localhost:2019}"
 DOMAIN_SUFFIX="${DOMAIN_SUFFIX:-localhost}"
 
 if curl --silent --fail "${CADDY_API}/config/" >/dev/null 2>&1; then
-    CONTAINER_IP=$(podman inspect "$CONTAINER_NAME" \
+    UPSTREAM="${CONTAINER_NAME}:${PORT}"
-        --format '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}')
-    UPSTREAM="${CONTAINER_IP}:${PORT}"
     log "Updating Caddy: ${APP_ID}.${DOMAIN_SUFFIX} → ${UPSTREAM}"
 
     # Discover actual server name (Caddyfile adapter names it 'srv0', not 'hiy').

infra/docker-compose.yml

@@ -73,7 +73,7 @@ services:
       - ../proxy/Caddyfile:/etc/caddy/Caddyfile:ro
       - caddy-data:/data
       - caddy-config:/config
-    command: caddy run --config /etc/caddy/Caddyfile --adapter caddyfile
+    command: caddy run --config /etc/caddy/Caddyfile --adapter caddyfile --resume
     networks:
       - hiy-net
       - default