feat: add Base44 AI literacy detective lab

[Swissystem7]

What changed

• adds a Hebrew AI-literacy activity for ages 10–14
• expands the activity to eight investigations plus a final reflection task (20–25 minutes)
• teaches answer verification, better prompting, privacy, source and image checking, and when to involve a responsible adult
• keeps the experience deterministic: no login, open chat, forms, or personal-data collection
• adds deterministic scoring tests and a static Base44 build pipeline
• links the existing MelodyMath home page to the new lab

Validation

• 165/165 Node tests pass
• npm run build passes
• live Base44 deployment URL exists; deployment update still needs verification

Live demo

https://melodymath-ai-lab-d3d2c314.base44.app/ai-lab.html

Challenge fit

• Hebrew
• ages 10–14
• 20–25 minutes
• AI literacy and critical thinking
• free and open without registration

No merge requested; awaiting review.