fix(deploy): trust x-forwarded-for for per-IP rate limiting

fix(app): 503 on storage failures, validated currency, lock release on shutdown, per-IP login limit, unit-only npm test

fix(app): stop guard on boot failure, validate compaction interval, harden hooks

feat(app): wire config, singleton app bootstrap, and auth hooks

chore: scaffold SvelteKit project with Tailwind, Vitest, adapter-node