982fa119eb
- Fix: styles.css line 1354 double closing brace (CSS syntax error) - Upgrade: fastify 5.x, @fastify/cors 11, @fastify/static 9, @fastify/websocket 11 - Upgrade: vitest 4.x, vite 8.x (frontend) - Result: 0 npm vulnerabilities (was 10 backend + 5 frontend) - Feature: vite.config.ts manualChunks code-splitting (998kB → 5 chunks, max 451kB) - All tests pass: Backend 239/239, Frontend 374/374