Update linux sh files and appdir folder

appdir-example/run-nebula.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+# Run Nebula with portable data storage
+# User data (cookies, history, bookmarks) is stored in usr/data/ alongside the app.
+set -e
+
+HERE="$(cd "$(dirname "$0")" && pwd)"
+
+export APPDIR="$HERE"
+export PATH="$HERE/usr/bin:$PATH"
+export LD_LIBRARY_PATH="$HERE/usr/lib:$HERE/usr/lib64:$LD_LIBRARY_PATH"
+
+# --- PORTABLE DATA CONFIGURATION ---
+# Store user data in a local folder for portable operation
+PORTABLE_DATA_DIR="$HERE/usr/data"
+export NEBULA_PORTABLE=1
+export NEBULA_PORTABLE_PATH="$PORTABLE_DATA_DIR"
+
+# Create portable data directory with secure permissions if it doesn't exist
+if [ ! -d "$PORTABLE_DATA_DIR" ]; then
+	mkdir -p "$PORTABLE_DATA_DIR"
+	chmod 700 "$PORTABLE_DATA_DIR"
+fi
+
+exec "$HERE/nebula-appdir/AppRun"