frontend added

[iakkov]

Note

Adds a simple local CRUD frontend for users, enables CORS in the user-service, and updates docker-compose by adding Redis and tweaking Kafka deps.

• Frontend:
  • CRUD UI: Add frontend/index.html and frontend/app.js with forms and table to list, get, create, update, and delete users via http://localhost:8080/users.
• Backend:
  • CORS: Introduce CorsConfig to allow localhost origins, common methods, and headers.
• DevOps:
  • Docker Compose: Add redis service with persisted volume; remove kafka depends_on condition; clean up duplicate Redis definition.

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