feat: replay AIGuard portfolio cases in Studio

[hyeokjun32]

Summary

• Added AIGuard portfolio diagnosis cases to Local Studio demo evidence.
• Displayed normal, bbox collapse, score saturation, and temporal instability guard cases.
• Extended Studio route/static tests for the guard demo bundle.

Validation

• node --check inferedgelab/studio/static/app.js
• PYTHONDONTWRITEBYTECODE=1 poetry run python3 -m pytest tests/test_studio_routes.py -q
• PYTHONDONTWRITEBYTECODE=1 poetry run python3 -m pytest -q

Impact

• Completes Phase 6 portfolio demo replay from the browser.
• Helps reviewers understand why guard evidence can pass, require review, or block.

Notes

• AIGuard remains optional and Lab remains deployment decision owner.
• No DB/queue/auth/billing or production SaaS behavior added.