fix: rename api service to web in all docker-compose files

- Aligns compose service name with the image name (hrynco.notification-service.web)
- Rename API_PORT env var to WEB_PORT for consistency

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

docker/environments/docker-compose.prod.yml

@@ -3,11 +3,11 @@ services:
     build: {}
     image: registry.grynco.com.ua/hrynco.notification-service.migrator:${MIGRATOR_IMAGE_TAG:?MIGRATOR_IMAGE_TAG is required}
 
-  api:
+  web:
     build: {}
     image: registry.grynco.com.ua/hrynco.notification-service.web:${WEB_IMAGE_TAG:?WEB_IMAGE_TAG is required}
     ports:
-      - "${API_PORT:?API_PORT is required}:8080"
+      - "${WEB_PORT:?WEB_PORT is required}:8080"
     environment:
       - Serilog__WriteTo__1__Args__serverUrl=${SEQ_URL:-}
     restart: always