feat(modal): add rollout telemetry foundation

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

assets/admin/src/constants/sections/tools.js

@@ -25,6 +25,16 @@ export const toolsSection = {
       canonicalDomain: 'tools',
       section: 'backup',
     }),
+    schemaPage({
+      key: 'tools-modal-rollout',
+      name: 'ToolsModalRollout',
+      label: '前台弹窗灰度',
+      route: '/tools/modal-rollout',
+      title: '前台弹窗灰度',
+      desc: '按领域控制前台弹窗新流程的分阶段发布。',
+      canonicalDomain: 'tools',
+      section: 'modal-rollout',
+    }),
     customPage({
       key: 'tools-health',
       name: 'ToolsHealth',