Add update-vendor.sh symlink support, unify install.sh vendor flow

- update-vendor.sh now creates webui/vendor symlinks (htm.js)
- install.sh calls update-vendor.sh after package install
- Add vendor/.empty and webui/vendor/.empty as directory placeholders in git

scripts/update-vendor.sh

@@ -5,6 +5,7 @@ set -euo pipefail
 
 # ---- Library versions ----
 ACME_VERSION="3.1.3"
+HTM_VERSION="3.1.1"
 
 VENDOR="vendor"
 
@@ -22,6 +23,32 @@ download "acme.sh@${ACME_VERSION}" \
     "https://raw.githubusercontent.com/acmesh-official/acme.sh/${ACME_VERSION}/acme.sh" \
     "${VENDOR}/acme.sh"
 
+download "htm@${HTM_VERSION}" \
+    "https://raw.githubusercontent.com/developit/htm/${HTM_VERSION}/mini/index.module.js" \
+    "${VENDOR}/htm.js"
+
 chmod +x "${VENDOR}/acme.sh"
 
+# --- Symlinks for webui ---
+WEBUI_VENDOR="webui/static/vendor"
+mkdir -p "$WEBUI_VENDOR"
+
+WEBUI_LINKS=(
+  "htm.js:../../../vendor/htm.js"
+)
+
+for entry in "${WEBUI_LINKS[@]}"; do
+  IFS=':' read -r name target <<< "$entry"
+  if [[ -L "${WEBUI_VENDOR}/${name}" ]]; then
+    cur=$(readlink "${WEBUI_VENDOR}/${name}")
+    if [[ "$cur" != "$target" ]]; then
+      echo "[symlink] ${WEBUI_VENDOR}/${name} → ${target} (updated)"
+      ln -sf "$target" "${WEBUI_VENDOR}/${name}"
+    fi
+  else
+    echo "[symlink] ${WEBUI_VENDOR}/${name} → ${target}"
+    ln -sf "$target" "${WEBUI_VENDOR}/${name}"
+  fi
+done
+
 echo "[done] All libraries vendored."