2919e1afc4
Comprehensive design for two interactive tools: - Prozesskostenrechner: DE (LG/OLG/BGH/BPatG), UPC, and EPA cost estimates - Fristenrechner: Patent deadline calculator with holiday adjustment Covers UI layout, data models, API contracts, calculation logic, fee tables (GKG/RVG/PatKostG/UPC/EPA), deadline rules for all proceeding types, and phased implementation plan. Key differentiator: EPA proceedings coverage (not in KanzlAI).