fix(publish): always bundle ui-dist into server package

scripts/prepare-server-ui-dist.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# prepare-server-ui-dist.sh — Build the UI and copy it into server/ui-dist.
+# This keeps @paperclipai/server publish artifacts self-contained for static UI serving.
+
+REPO_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+UI_DIST="$REPO_ROOT/ui/dist"
+SERVER_UI_DIST="$REPO_ROOT/server/ui-dist"
+
+echo "  -> Building @paperclipai/ui..."
+pnpm --dir "$REPO_ROOT" --filter @paperclipai/ui build
+
+if [ ! -f "$UI_DIST/index.html" ]; then
+  echo "Error: UI build output missing at $UI_DIST/index.html"
+  exit 1
+fi
+
+rm -rf "$SERVER_UI_DIST"
+cp -r "$UI_DIST" "$SERVER_UI_DIST"
+echo "  -> Copied ui/dist to server/ui-dist"