feat(web): 告警管理前端页面 + 路由注册 + bugfix

新增:
- AlertList 告警列表页: 状态筛选/确认/忽略操作
- AlertRuleList 告警规则页: 创建/编辑/启停管理
- alerts + deviceReadings 前端 API 层
- App.tsx 路由注册 + MainLayout 标题 fallback
- wiki/frontend.md 更新页面清单

修复:
- ArticleEditor: 修复 unused variable 构建错误
- FollowUpTaskList: 修复 filter(Boolean) 类型窄化问题

apps/web/src/App.tsx

@@ -43,6 +43,8 @@ const StatisticsDashboard = lazy(() => import('./pages/health/StatisticsDashboar
 const AiPromptList = lazy(() => import('./pages/health/AiPromptList'));
 const AiAnalysisList = lazy(() => import('./pages/health/AiAnalysisList'));
 const AiUsageDashboard = lazy(() => import('./pages/health/AiUsageDashboard'));
+const AlertList = lazy(() => import('./pages/health/AlertList'));
+const AlertRuleList = lazy(() => import('./pages/health/AlertRuleList'));
 
 // 内容管理
 const ArticleManageList = lazy(() => import('./pages/health/ArticleManageList'));
@@ -209,6 +211,8 @@ export default function App() {
                       <Route path="/health/ai-prompts" element={<AiPromptList />} />
                       <Route path="/health/ai-analysis" element={<AiAnalysisList />} />
                       <Route path="/health/ai-usage" element={<AiUsageDashboard />} />
+                      <Route path="/health/alerts" element={<AlertList />} />
+                      <Route path="/health/alert-rules" element={<AlertRuleList />} />
                       {/* 内容管理 */}
                       <Route path="/health/articles" element={<ArticleManageList />} />
                       <Route path="/health/articles/new" element={<ArticleEditor />} />