Generate Color Palette

Generate Color Palette — 根据基础颜色（十六进制）和配色方案（互补色/类似色/三角色/单色/四角色）生成和谐的调色板，返回每个颜色的HEX/RGB/HSL值。基于标准色彩理论算法，纯本地计算，无需任何外部API或第三方依赖。

Generate a harmonious color palette from a base hex color using color theory (complementary, analogous, triadic, monochromatic, tetradic schemes). Returns HEX/RGB/HSL for each color. Pure local computation based on standard color theory — no external API or third-party dependency required.