fix: 租户表单提交前去除字符串字段首尾空格

Made-with: Cursor

frontend/src/views/system/tenants/Index.vue

@@ -571,8 +571,19 @@ const handleDelete = (record: Tenant) => {
     })
 }
 
+/** 提交前去除表单字符串字段首尾空格，再执行校验与保存 */
+const trimTenantFormStrings = () => {
+    form.name = (form.name ?? '').trim()
+    form.code = (form.code ?? '').trim()
+    form.domain = (form.domain ?? '').trim()
+    form.description = (form.description ?? '').trim()
+    form.adminUsername = (form.adminUsername ?? '').trim()
+    form.adminPassword = (form.adminPassword ?? '').trim()
+}
+
 const handleSubmit = async () => {
     try {
+        trimTenantFormStrings()
         await formRef.value?.validate()
         submitLoading.value = true