feat(security): add rate limiting to protect API endpoints

Introduce ThrottlerModule to enforce rate limits of 20 requests per minute per IP. This prevents abuse and ensures fair usage of the API resources.

README.md

@@ -18,4 +18,4 @@ It handles:
 
 ## Monitoring
 - **Health Check**: `https://huggingface.co/spaces/Auspicious14/MaternAlert/api/v1/health`
-- **Logs**: View the "Logs" tab in this Space to see cron job execution.
+- **Logs**: View the "Logs" tab in this Space to see cron job execution.

src/app.module.ts

@@ -26,6 +26,14 @@ import { HealthController } from "./health.controller";
     // Scheduling
     ScheduleModule.forRoot(),
 
+    // Throttling
+    ThrottlerModule.forRoot([
+      {
+        ttl: 60000,
+        limit: 20,
+      },
+    ]),
+
     // Database (Prisma) - Global module
     DatabaseModule,