fix(mindspace): lower page access password minimum to 6 characters

Align publication validation, portal gate HTML, H5 publish UI, MCP docs,
and page-data skill guidance so passwords like 888888 are accepted while
3-character values such as 888 remain rejected.

Co-authored-by: Cursor <cursoragent@cursor.com>

page-data-validation-suggestions.mjs

@@ -45,7 +45,7 @@ const SUGGESTION_BY_CODE = Object.freeze({
     title: '页面数据绑定或发布失败',
     actions: Object.freeze([
       '确认 dataset 已 private_data_register_dataset 注册',
-      '对每个公开页调用 private_data_bind_workspace_page（含 password 策略时口令 ≥8 位）',
+      '对每个公开页调用 private_data_bind_workspace_page（含 password 策略时口令 ≥6 位）',
       '检查 .mindspace/page-data-policies 是否生成且列白名单与表单字段一致',
     ]),
   }),