fix: script portability and npm security updates

Scripts:
- stop.sh: replace Linux-only fuser with cross-platform lsof fallback
- start.sh: parameterize port (APP_PORT) and container name (dynamic lookup)
- app-dev-start.sh: cross-platform stat (GNU -c / BSD -f) and setpriv/su fallback
- deploy-compose.sh: parameterize Docker registry via DOCKER_REGISTRY env var
- harden-postgres.sh: make DB_USER and DB_NAME configurable via env vars

NPM security:
- next: 15.5.12 → 15.5.15 (fixes HTTP request smuggling CVE)
- nodemailer: 8.0.1 → 8.0.5 (fixes SMTP command injection CVEs)
- lodash-es: add pnpm override to force >=4.18.0 (fixes code injection + prototype pollution)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tooling/docker/app-dev-start.sh

@@ -17,15 +17,28 @@ pnpm --filter @capakraken/db db:migrate:deploy
 pnpm check:exports
 pnpm check:imports
 
-repo_uid="$(stat -c '%u' /app)"
-repo_gid="$(stat -c '%g' /app)"
 repo_home="/tmp/capakraken-dev-home"
 
+# Cross-platform stat: GNU stat uses -c, BSD/macOS stat uses -f
+if stat -c '%u' /app >/dev/null 2>&1; then
+  repo_uid="$(stat -c '%u' /app)"
+  repo_gid="$(stat -c '%g' /app)"
+else
+  repo_uid="$(stat -f '%u' /app)"
+  repo_gid="$(stat -f '%g' /app)"
+fi
+
 mkdir -p /app/apps/web/.next
 mkdir -p "$repo_home/.config/pnpm"
 chown -R "$repo_uid:$repo_gid" /app/apps/web/.next
 chown -R "$repo_uid:$repo_gid" "$repo_home"
 
-exec setpriv --reuid="$repo_uid" --regid="$repo_gid" --clear-groups \
-  env HOME="$repo_home" XDG_CONFIG_HOME="$repo_home/.config" \
-  pnpm --filter @capakraken/web exec next dev -H 0.0.0.0 -p 3100
+# Cross-platform privilege drop: setpriv (Linux) or su (macOS/BSD)
+if command -v setpriv >/dev/null 2>&1; then
+  exec setpriv --reuid="$repo_uid" --regid="$repo_gid" --clear-groups \
+    env HOME="$repo_home" XDG_CONFIG_HOME="$repo_home/.config" \
+    pnpm --filter @capakraken/web exec next dev -H 0.0.0.0 -p 3100
+else
+  exec su -s /bin/sh "#${repo_uid}" -c \
+    "HOME='$repo_home' XDG_CONFIG_HOME='$repo_home/.config' pnpm --filter @capakraken/web exec next dev -H 0.0.0.0 -p 3100"
+fi