observability: fix alloy ui component, busybox healthchecks for loki/alloy

- alloy 1.x renamed the server component to ui; the old block failed the
  initial load and the container crash-looped
- grafana/loki is distroless and grafana/alloy lacks wget, so their
  healthchecks could never run; local images add a static busybox from
  alpine for that one command
- deploy.sh builds all three local images if missing
- tests: 3 new seams

scripts/deploy.sh

@@ -139,10 +139,16 @@ fi
 
 if [ '${COMPOSE_UP[$TARGET]}' = '1' ]; then
   echo '[4/4] Restarting stack...'
-  if ! podman image exists franksdank/caddy-porkbun:latest; then
-    echo '  franksdank/caddy-porkbun image missing; building it (a few minutes)...'
-    podman build -t franksdank/caddy-porkbun:latest -f dankclaw/caddy/Containerfile .
-  fi
+  # Locally built images: caddy + porkbun module, and loki/alloy + a static
+  # busybox (their upstream images lack the wget the healthchecks need).
+  for dir in caddy loki alloy; do
+    img=franksdank/$dir
+    [ "$dir" = "caddy" ] && img=franksdank/caddy-porkbun
+    if ! podman image exists $img:latest; then
+      echo "  $img image missing; building it..."
+      podman build -t $img:latest -f dankclaw/$dir/Containerfile .
+    fi
+  done
   podman-compose -f '${COMPOSE[$TARGET]}' up -d
 else
   echo '[4/4] Skipping compose restart (stack runs as bare containers on this host)'