Add RAG_WEB_LOADER + Playwright mode + improve stability of search

backend/start.sh

@@ -3,6 +3,15 @@
 SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
 cd "$SCRIPT_DIR" || exit
 
+# Add conditional Playwright browser installation
+if [[ "${RAG_WEB_LOADER,,}" == "chromium" ]]; then
+    echo "Installing Playwright browsers..."
+    playwright install chromium
+    playwright install-deps chromium
+
+    python -c "import nltk; nltk.download('punkt_tab')"
+fi
+
 KEY_FILE=.webui_secret_key
 
 PORT="${PORT:-8080}"