Add bilingual native_range and wildlife_value fields (DE/EN) to species

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.

herbapi-api/migrations/011_species_bilingual_range_wildlife.sql

@@ -0,0 +1,4 @@
+ALTER TABLE species ADD COLUMN IF NOT EXISTS native_range_de TEXT;
+ALTER TABLE species ADD COLUMN IF NOT EXISTS native_range_en TEXT;
+ALTER TABLE species ADD COLUMN IF NOT EXISTS wildlife_value_de TEXT;
+ALTER TABLE species ADD COLUMN IF NOT EXISTS wildlife_value_en TEXT;