feat: add registration Zod validation schema

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

server/utils/auth/validation.ts

@@ -0,0 +1,17 @@
+import { z } from 'zod'
+
+export const registerSchema = z
+  .object({
+    username: z
+      .string()
+      .min(3, '用户名至少需要3个字符')
+      .max(30, '用户名最多30个字符'),
+    password: z.string().min(8, '密码至少需要8个字符'),
+    confirmPassword: z.string(),
+    captchaToken: z.string().min(1, '验证码令牌不能为空'),
+    captchaText: z.string().min(1, '验证码不能为空'),
+  })
+  .refine((data) => data.password === data.confirmPassword, {
+    message: '两次输入的密码不一致',
+    path: ['confirmPassword'],
+  })