Add LAN-friendly dev scripts and env examples

backend/.env.example

@@ -1,2 +1,7 @@
+# Example config for local/dev.
+#
+# If you plan to access the app from another device (via machine IP),
+# set CORS_ORIGINS to include that frontend origin too.
+
 DATABASE_URL=postgresql+psycopg2://postgres:CHANGE_ME@127.0.0.1:5432/openclaw_agency
-CORS_ORIGINS=http://localhost:3000
+CORS_ORIGINS=http://localhost:3000,http://<YOUR_MACHINE_IP>:3000

frontend/.env.example

@@ -0,0 +1,4 @@
+# When accessing the frontend from another device, the browser will call this URL.
+# Use your machine IP (not 127.0.0.1).
+
+NEXT_PUBLIC_API_URL=http://<YOUR_MACHINE_IP>:8000

frontend/package.json

@@ -6,7 +6,8 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "eslint"
+    "lint": "eslint",
+    "dev:lan": "next dev --hostname 0.0.0.0 --port 3000"
   },
   "dependencies": {
     "next": "16.1.6",