added health check endpoint

Author: Shahidul-Khan2004

Backend/config/urls.py

@@ -16,8 +16,14 @@
 """
 from django.contrib import admin
 from django.urls import include, path
+from django.http import JsonResponse
+
+def health_check(request):
+    """Health check endpoint for Render"""
+    return JsonResponse({"status": "healthy", "service": "TOC-Simulator API"})
 
 urlpatterns = [
+    path('health/', health_check, name='health_check'),
     path('admin/', admin.site.urls),
     path('auth/', include('apps.authentication.urls')),
 ]