♻️ refactor(users): optimize user form data handling

- 统一处理表单提交数据，提取submitData变量避免重复代码
- 为email、phone和name字段添加transform转换，将空字符串转为null
- 简化编辑和创建用户时的请求数据构建逻辑

src/client/admin-shadcn/pages/Users.tsx

@@ -28,9 +28,9 @@ type UpdateUserRequest = InferRequestType<typeof userClient[':id']['$put']>['jso
 const userFormSchema = z.object({
   username: z.string().min(3, '用户名至少3个字符'),
   nickname: z.string().optional(),
-  email: z.string().email('请输入有效的邮箱地址').optional().or(z.literal('')),
-  phone: z.string().regex(/^1[3-9]\d{9}$/, '请输入有效的手机号').optional().or(z.literal('')),
-  name: z.string().optional(),
+  email: z.email('请输入有效的邮箱地址').optional().or(z.literal('')).transform(val => val || null),
+  phone: z.string().regex(/^1[3-9]\d{9}$/, '请输入有效的手机号').optional().or(z.literal('')).transform(val => val || null),
+  name: z.string().optional().or(z.literal('')).transform(val => val || null),
   password: z.string().min(6, '密码至少6个字符').optional(),
   isDisabled: z.boolean().default(false),
 });
@@ -124,14 +124,16 @@ export const UsersPage = () => {
   // 处理表单提交
   const handleSubmit = async (data: UserFormData) => {
     try {
+      const submitData = {
+        ...data,
+        isDisabled: data.isDisabled ? 1 : 0,
+      };
+
       if (editingUser) {
         // 编辑用户
         const res = await userClient[':id']['$put']({
           param: { id: editingUser.id },
-          json: {
-            ...data,
-            isDisabled: data.isDisabled ? 1 : 0,
-          } as UpdateUserRequest
+          json: submitData as UpdateUserRequest
         });
         if (res.status !== 200) {
           throw new Error('更新用户失败');
@@ -140,10 +142,7 @@ export const UsersPage = () => {
       } else {
         // 创建用户
         const res = await userClient.$post({
-          json: {
-            ...data,
-            isDisabled: data.isDisabled ? 1 : 0,
-          } as CreateUserRequest
+          json: submitData as CreateUserRequest
         });
         if (res.status !== 201) {
           throw new Error('创建用户失败');