refactor(admin): consolidate duplicate configuration

Remove duplicate comment, captcha, filing, and website-security configuration paths.

Move front submission verification to the captcha scene matrix and retire obsolete admin routes and components.

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

@@ -23,7 +23,6 @@ export const submitSchema = {
     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,
@@ -63,7 +62,6 @@ export const submitSchema = {
         { 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: '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 } },