luccast turns Mike into a single-user desktop app

luccast has rebuilt Mike as a single-player local-only tool. The cloud database is replaced with an embedded one that lives on disk, file storage moves to a local folder, and the login layer is short-circuited so every request is treated as the same solo user. There is no signup, no tenant, no remote infrastructure to pay for.

The AI side gets the same treatment. A new adapter points Mike at a local language model running on your own machine via tools like LM Studio or Ollama (apps that let you run open-source AI models on a laptop). The settings page auto-detects the local setup and hides the cloud API-key fields when it sees one. Follow-up commits polish the launcher script, rewrite the README around this story, and fix a bug where the local model wasn't being picked up correctly.