Migration 011 adds native_range_de, native_range_en, wildlife_value_de,
wildlife_value_en columns. Backend INSERT/UPDATE queries updated ($64→$68).
Frontend species and cultivar detail pages use pick_desc() for language selection.
Backend: add 6 new columns to Species and CreateSpecies structs, update
INSERT/UPDATE queries, add migration 010.
Frontend: add fields to Species type, use pick_desc() for language-aware
display in species detail and cultivar species-info card.
Add indoor_sowing_weeks, direct_sowing_weeks, transplanting_weeks,
glasshouse_weeks, harvesting_weeks (integer[]) to backend Cultivar and
CreateCultivar structs with INSERT/UPDATE SQL bindings.
Frontend PlantingCalendar component rewritten as a compact 52-column
Gantt-style grid grouped by month headers. Prefers week data when
available, falls back to expanding month data into week ranges.
Calendar displayed full-width on cultivar detail page with color legend.
florian.berthold