Refactor llm initialization and update call_model

Update lang_service.py

Update app.py

Add files via upload

Add files via upload

Fix API base URL for production environment

Update api.js

Update CMD to reference 'app' instead of 'backend.app'

Add files via upload

Add files via upload

Delete render.yaml

Delete models.py

Delete langgraph_service.py

Delete lang_service.py

Delete config.py