v1.5 seal: app.py header bumped to v1.5 (no functional change)

v1.3: add Stage 1 universal abstract image display + v3 judge methodology link

Restore HF-Hub-loading app.py from bbc7f71d (overwrote in 73ec45) + add show_api=False

Disable show_api to skip buggy schema generation

Initial Space deployment: Stage 2 fusion demo (CPU, free tier)