Update README.md

Add .gitattributes for LFS support and include Demo video in README

Enhance CARD.md with detailed training data and validation section; update smoke_space.py with default problem prompts and validation checks

Align tutor dataset and smoke validation

Add smoke tests and tighten model contract

Polish Pocket Tutor loading and layout styling

Align Pocket Tutor with MiniCPM-V

Refine Pocket Tutor blackboard UI

Refine Pocket Tutor UI and quiet warnings

Clean Pocket Tutor runtime and docs

Align Pocket Tutor README docs

Refine Space tags

Build Pocket Tutor Space