docs: add frontend/.env.local.example with NEXT_PUBLIC_API_URL

Author: DHANUSHGCODE

frontend/.env.local.example

@@ -0,0 +1,12 @@
+# Copy this file to .env.local and fill in your values
+# cp .env.local.example .env.local
+
+# Backend API URL (used by Next.js dashboard to fetch logs and predictions)
+# For local development:
+NEXT_PUBLIC_API_URL=http://localhost:8000
+
+# For Docker Compose:
+# NEXT_PUBLIC_API_URL=http://backend:8000
+
+# For production deployment (replace with your actual backend URL):
+# NEXT_PUBLIC_API_URL=https://your-backend-domain.com