fix: update API base URL and add healthcheck for backend service

docker-compose.yml

@@ -30,12 +30,17 @@ services:
     depends_on:
       db:
         condition: service_healthy
+    healthcheck:
+      test: ["CMD-SHELL", "curl -f http://localhost:8080/actuator/health || exit 1"]
+      interval: 10s
+      timeout: 5s
+      retries: 5        
 
   frontend:
     build: 
       context: ./frontend
       args:
-        VITE_BASE_URL: "http://localhost:8082/api/todos"      
+        VITE_BASE_URL: "http://localhost:8082/api"      
     container_name: todo-frontend
     ports:
       - "5173:80"