v0.1.1 – Safe DB schema migration

This release hardens the database layer to evolve safely without data loss.

Added

• Idempotent schema migration for lab_notes
• Lightweight schema version tracking via schema_meta
• Startup logging when schema changes are applied

Changed

• Centralized database migration logic into a dedicated module
• Made database bootstrap resilient to existing and older schemas

Notes

• No API behavior changes
• Safe to deploy over existing databases