feat(front-submit): 1:1 写文章/投稿页对齐 zibll newposts

Register AKSRT 写文章/投稿 page template, wire header publish entry to
front submit URL, rewrite page-submit as dual-column TinyMCE compose with
featured cover, multi-category/topics/filters, pay box, drafts, and
capability-gated FrontSubmit AJAX (pay/featured traits).

assets/admin/src/schema/sections/post-list/submit.js

@@ -22,6 +22,8 @@ export const submitSchema = {
     front_submit_editor_mode: 'rich',
     front_submit_draft_save: true,
     front_submit_leave_warning: true,
+    front_submit_guest_enabled: false,
+    front_submit_captcha: false,
     post_article_btn_txte: '发布文章',
     post_article_title_strlen_limit_min: 5,
     post_article_title_strlen_limit_max: 30,
@@ -59,7 +61,9 @@ export const submitSchema = {
         { key: 'front_submit_cover', label: '封面图', type: 'switch', default: true, dependsOn: { key: 'front_submit_enabled', value: true } },
         { key: 'front_submit_category', label: '分类选择', type: 'switch', default: true, dependsOn: { key: 'front_submit_enabled', value: true } },
         { key: 'post_article_cat', label: '允许投稿分类', type: 'taxonomy_select', taxonomy: 'category', multiple: true, default: [], help: '为空则允许全部分类', dependsOn: { key: 'front_submit_enabled', value: true } },
-        { key: 'post_article_user', label: '免登录归属用户', type: 'user_select', default: 0, help: '免登录投稿时文章归属的用户，搜索选择', dependsOn: { key: 'front_submit_enabled', value: true } },
+        { key: 'front_submit_guest_enabled', label: '允许免登录投稿', type: 'switch', default: false, help: '开启后访客可投稿；文章归属到下方用户', dependsOn: { key: 'front_submit_enabled', value: true } },
+        { key: 'post_article_user', label: '免登录归属用户', type: 'user_select', default: 0, help: '免登录投稿时文章归属的用户，搜索选择', dependsOn: { key: 'front_submit_guest_enabled', value: true } },
+        { key: 'front_submit_captcha', label: '提交人机验证', type: 'switch', default: false, help: '提交正式投稿时校验人机验证（需在安全扩展启用 captcha）', dependsOn: { key: 'front_submit_enabled', value: true } },
         { key: 'front_submit_tags', label: '标签输入', type: 'switch', default: true, dependsOn: { key: 'front_submit_enabled', value: true } },
         { key: 'post_article_topics_s', label: '专题选择', type: 'switch', default: false, help: '投稿时可选择专题分类', dependsOn: { key: 'front_submit_enabled', value: true } },
         { key: 'post_article_custom_filter_s', label: '高级筛选选择', type: 'switch', default: true, help: '投稿时可选择自定义筛选维度值', dependsOn: { key: 'front_submit_enabled', value: true } },