feat(phase-34): wire BenfordsAnalyzer + GhostCompanyDetector + ShadowDirectorDetector into risk scorer

fix(M-03,M-06,M-08): add mobile CSS overrides for inline grid layouts; add NONE risk level for score=0; clamp risk score to 0-100

fix(H-08): replace substring audit name match with relationship-based + word-boundary match -- eliminates false positives for common words like 'India', 'National'

fix(api): C-02+H-04 -- risk None crash and missing risk signals

feat(api): FastAPI backend with entity search, dossier, graph, and risk endpoints