docs: complete project research
Files:
- STACK.md
- FEATURES.md
- ARCHITECTURE.md
- PITFALLS.md
- SUMMARY.md
Key findings:
- Stack: FastAPI 0.135.1 + React 19 + Vite 7 + Tailwind v4, single-container deploy
- Architecture: FastAPI serves React SPA via catch-all, file-based storage (Docker volume), LLMService with retry/backoff
- Critical pitfall: All 9 pitfalls map to Phase 1 — Italian prompts, Canva field constants, UTF-8 BOM, root_path config, per-item bulk isolation
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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