- Move auth schema from auth-schema.ts to lib/db/schema/auth.ts
- Export auth tables (user, session, account, verification, passkey) via barrel
- Add FK from performanceEntries.userId to user.id
- Generate and apply migration for auth tables + user FK
- Remove unused echarts dependency
- Add drizzle.config.ts with PostgreSQL dialect configuration
- Create lib/db/index.ts with Drizzle ORM client and pg Pool
- Add db:generate, db:migrate, db:studio, db:push scripts to package.json
Part of Chunk 1: Drizzle Config & DB Client setup