feat: 添加渐变色工具函数

- 创建渐变色样式生成函数
- 创建光晕效果生成函数
- 创建文字渐变效果函数
- 支持蓝色和紫色光晕

src/lib/gradients.ts

@@ -0,0 +1,29 @@
+import { gradients } from './colors';
+
+export const getGradientStyle = (type: keyof typeof gradients) => {
+  return {
+    background: gradients[type],
+  };
+};
+
+export const getGlowStyle = (color: 'blue' | 'purple', opacity: number = 0.15) => {
+  const colorValue = color === 'blue' ? '0, 217, 255' : '168, 85, 247';
+  return {
+    background: `radial-gradient(circle, rgba(${colorValue}, ${opacity}) 0%, transparent 70%)`,
+  };
+};
+
+export const getBorderGradientStyle = () => {
+  return {
+    borderImage: `${gradients.primary} 1`,
+  };
+};
+
+export const getTextGradientStyle = () => {
+  return {
+    background: gradients.primary,
+    WebkitBackgroundClip: 'text',
+    WebkitTextFillColor: 'transparent',
+    backgroundClip: 'text',
+  };
+};