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

frontend/Dockerfile

@@ -6,6 +6,10 @@ RUN npm install
 COPY . .
 ARG VITE_APP_VERSION=dev
 ENV VITE_APP_VERSION=${VITE_APP_VERSION}
+
+ARG VITE_BASE_URL=https://todo.almazlar.com/api
+ENV VITE_BASE_URL=${VITE_BASE_URL}
+
 RUN npm run build
 
 # Run stage

frontend/src/services/api.js

@@ -2,7 +2,7 @@
 // Vite automatically injects the variable defined in .env.* based on the current mode.
 // `import.meta.env.VITE_BASE_URL` is the single source of truth for the API root.
 
-const BASE_URL = import.meta.env.VITE_BASE_URL;
+const BASE_URL = import.meta.env.VITE_BASE_URL + '/todos';
 
 // -----------------------------------------------------------------------------
 // API helpers