boards: add proteases, nuclear receptors, epigenetics (8 boards)

boards: add cardiac safety margin (selectivity)

boards: add 14 boards (GPCR 6, anti-infective 2, ADMET 6)

Open the cell-morphology board built from JUMP Cell Painting

Leader table per board; drug-withdrawal board with year-matched controls

Bilingual UI (ko/en) with browser detection and a language switch

19 boards across 5 categories; daily cap enforced

SPA: categories, board tabs, testset serving, submit API