README: point thumbnail to new Space-hosted brand card

polish: add tags + model refs + thumbnail for HF discoverability

feat: ?ref=GHKN4L37 on outbound links (HF Space attribution)

fix: drop sdk_version pin, let HF select compatible gradio

fix: pin python_version 3.11 to avoid Python 3.13 audioop removal

Initial Space: Gradio chat UI for DeepSeek V3/R1 + Qwen 3.5

initial commit