litellm-vertex-proxy-repair

Diagnose and repair a local LiteLLM + Vertex AI proxy on macOS, especially when http://127.0.0.1:4000/ or /v1 is down, startup hangs at Waiting for application startup, /ui/login/ says Authentication Error, Not connected to DB!, or Prisma/PostgreSQL issues need to be isolated from the API proxy by splitting lite and full modes.