T4-043: Mini app performance optimization

Track: 4 — Telegram Mini App
Section: Phase E: Infrastructure & Polish (18h)
Status: [ ] Todo
Repo: telegram-mini-app
Branch: feature/T4-043-miniapp-performance
Estimated Hours: 4h

Done When

Bundle size < 500KB. First paint < 1s. Lazy load non-critical screens. Image optimization

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