Horse and Stables Update

This update overhauls horses into a deep breeding, riding, and barn system with distinct roles, care mechanics, and transport tools. 🧬 Horse Breeds Horses now have specialized types: * Ponies: small, easy to tame, early-game travel * Racing Horses: fastest, low endurance * Draft Horses (Shire-type): slow but strong, pull heavy carts * Work Horses (Percheron-type): balanced, multi-use transport 🛠️ Transport * Carts: attach to draft horses for storage * Double carts: pulled by 2 horses for more capacity * Sleighs: snow biome transport bonus 🏡 Stables & Barns New build system includes sliding stable doors, head-out windows, hay feeders, and shavings bedding made from logs. These improve immersion and horse comfort. 🧼 Care System Players can brush and pet horses to increase a bond level. Higher bond improves speed, stamina, and responsiveness. 🧬 Breeding System Horses now have male/female genders. Breeding requires pairs and stable conditions. Offspring inherit traits: males influence speed/strength, females influence growth/health. 🎮 Riding New speed states: walk, trot, canter, gallop. Better bond improves control and stamina. 👨‍🌾 Villager & Farming A new livestock trader sells animals and barn items. A light manure system produces compostable fertilizer for farming.