chore: 重构项目结构

cwd-api/src/utils/getAvatar.ts

@@ -0,0 +1,19 @@
+/**
+ * 默认 gravatar.com 前缀
+ */
+const DEFAULT_AVATAR_PREFIX = 'https://gravatar.com/avatar';
+
+/**
+ * 辅助函数：生成 gravatar.com 头像地址 (MD5 算法)
+ * @param email - 邮箱地址
+ * @param prefix - 头像服务前缀，默认为 https://gravatar.com/avatar
+ */
+export const getCravatar = async (email: string, prefix?: string): Promise<string> => {
+  const cleanEmail = email.trim().toLowerCase();
+  const msgUint8 = new TextEncoder().encode(cleanEmail);
+  const hashBuffer = await crypto.subtle.digest('MD5', msgUint8);
+  const hashArray = Array.from(new Uint8Array(hashBuffer));
+  const hashHex = hashArray.map(b => b.toString(16).padStart(2, '0')).join('');
+  const avatarPrefix = prefix || DEFAULT_AVATAR_PREFIX;
+  return `${avatarPrefix}/${hashHex}?s=200&d=retro`;
+};