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/pages/users/UsersSignin.vue

@@ -229,14 +229,8 @@ async function load() {
     const inviteReward = creditData.invite_reward || {}
     const enabledScenarios = Array.isArray(captchaData.enabled_scenarios)
       ? captchaData.enabled_scenarios
-      : null
-    const disabledScenarios = Array.isArray(captchaData.disabled_scenarios)
-      ? captchaData.disabled_scenarios
       : []
-    const sceneOn = (key) => {
-      if (enabledScenarios) return enabledScenarios.includes(key)
-      return !disabledScenarios.includes(key)
-    }
+    const sceneOn = (key) => enabledScenarios.includes(key)
 
     creditSnapshot.value = creditData
     authSnapshot.value = authData