create a beautiful, busy, living koi pond using Three.js in a single HTML file. Include a waterfall, rocks, plants, and multiple koi fish with different colors and patterns. Make the scene feel alive through continuous fish movement, flowing water, and animated environmental details. Add a “Feed the koi” button. When clicked, food should appear on the water, and the fish should visibly swim toward it and eat it—not simply continue their normal swimming animation. Allow the camera to orbit and zoom so I can explore the pond. Make the scene visually polished, with convincing water, lighting, and depth. Deliver the complete working HTML file.
中文译文
用 Three.js 在单个 HTML 文件中打造一个美丽、热闹、生机勃勃的锦鲤池。包含瀑布、岩石、植物，以及多条颜色和花纹各异的锦鲤。通过持续不断的鱼的游动、流动的水和动态的环境细节，让场景显得鲜活。添加一个“Feed the koi”按钮。点击后，食物应出现在水面上，鱼要明显地朝食物游去并吃掉它——而不是继续它们平常的游动动画。允许相机环绕和缩放，好让我能探索这个池塘。让场景在视觉上精致考究，水面、光照与纵深都要令人信服。交付完整可运行的 HTML 文件。
