feat(models): Allow reliable models and update model selection logic in UI

feat: require live infrastructure for event store and inference, removing offline mode

feat: add Hugging Face inference backend next to Modal

feat(core): add resilient loop and shared blackboard

feat: unify model catalogue and self-hosted routing

feat: update model endpoint URLs and enhance documentation with mermaid diagrams

feat: LiteLLM gateway routing profiles to Modal-served small models

Refactor code structure for improved readability and maintainability