feat: Enhance registration process with improved validation and error handling

app/lib/validation.ts

@@ -1,8 +1,13 @@
 import { z } from "zod"
 
 export const authSchema = z.object({
-  username: z.string().min(1, "用户名不能为空"),
-  password: z.string().min(8, "密码长度必须大于等于8位"),
+  username: z.string()
+    .min(1, "用户名不能为空")
+    .max(20, "用户名不能超过20个字符")
+    .regex(/^[a-zA-Z0-9_-]+$/, "用户名只能包含字母、数字、下划线和横杠")
+    .refine(val => !val.includes('@'), "用户名不能是邮箱格式"),
+  password: z.string()
+    .min(8, "密码长度必须大于等于8位")
 })
 
 export type AuthSchema = z.infer<typeof authSchema>