docs: add hackathon README with tags, prizes, and submission metadata

fix: restore gallery example picker with proper gr.update returns

fix: pass absolute paths to gr.Examples so thumbnails render on Space

fix: real example photos, drop language dropdown, 2 examples per app

fix: dark hero header, colored submit button, path-safe examples

feat: polish UI, reveal animation, Tiny Titan badge, Oracle sampling

feat: tabbed multi-app UI

fix: backslash in f-string

fix: ZeroGPU compatibility

Initial upload: Vision Base MiniCPM-V 4.6 demo suite

initial commit