Fix: Use SHA-256 pre-hash to avoid bcrypt 72-byte limit

Fix: Handle bcrypt 72-byte password limit

Add debug signup endpoint

Fix Dockerfile CMD and add .dockerignore

Simplify Dockerfile for HuggingFace compatibility

Add health check and improve Dockerfile

Fix: Health check without database dependency

Fix: Lazy initialization for all settings to prevent import-time errors

Fix: Lazy database initialization for HuggingFace compatibility

Complete Todo API with deferred DB connection