fix: restore sdk_version 6.18.0 (gr.Server needs Gradio 6+)

fix: app_file → app.py

docs: add YouTube demo link, badges, capabilities

fix: sdk_version 6.18.0 (required for gr.Server)

fix: remove gradio from requirements (HF controls version)

fix: require gradio>=6.0 for gr.Server support

feat: custom HTML frontend (dark terminal, 4 panels, typing animation, history)

feat: migrate to gr.Server with custom FinOps Command Center UI

docs: add GGUF section, update badges to 6/6, add local run instructions

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initial commit