oauth.server.ts used a TypeScript parameter property (`public code: string`
in constructor) which is not supported by Node.js v25's strip-only TypeScript
mode. This caused the journal to crash-loop on startup after seeding OAuth
clients.
Also enable `erasableSyntaxOnly` in tsconfig.base.json so `pnpm typecheck`
catches any future use of non-erasable TypeScript syntax.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>