feat: add secret-gated inference proxy for external frontends

feat: add Firebase auth/farms backend alongside existing frontend

fix(ui): nudge farmers to double-check the crop on a "no clear match"

feat(gate): dedicated crop-ID classifier as the primary wrong-crop gate

feat: block wrong-crop submissions with a cross-crop gate

feat(hf): deploy the full redesigned frontend (keep in-process inference)

style(hf): Greenhouse palette, glassy background, display fonts, and custom cursor

CropIntel — HF Space deploy (all-in-one app)