- Create Drizzle schema with items, categories, and settings tables - Set up database connection singleton with WAL mode and foreign keys - Add seed script for default Uncategorized category - Create shared Zod validation schemas for items and categories - Export TypeScript types inferred from Zod and Drizzle schemas - Add in-memory SQLite test helper for isolated test databases - Wire seed into Hono server startup Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>