fix(系统设置): 系统参数SMTP密码长度处理

--bug=1035522 --user=王旭 【系统设置】系统-系统参数-SMTP密码-输入255字符未保存成功 https://www.tapd.cn/55049933/s/1462064

frontend/src/views/setting/system/config/components/baseConfig.vue

@@ -161,7 +161,7 @@
         <a-form-item :label="t('system.config.email.password')" field="password" asterisk-position="end">
           <a-input-password
             v-model:model-value="emailConfigForm.password"
-            :max-length="255"
+            :max-length="64"
             :placeholder="t('system.config.email.passwordPlaceholder')"
             autocomplete="new-password"
             allow-clear