test(frontend): UIUX E2E 测试 — 新增路由导航/创始人端/Admin端/工作台/移动端适配

新增 6 个 E2E 测试文件，覆盖 2-task-uiux.md 全部 50 项任务：
- uiux-navigation.spec.ts: 8 tests (today/compare/threads/workspace/ooda/ai-plus/profiles)
- sidebar-navigation.spec.ts: 6 tests (投资人 Sidebar 6 业务域)
- founder-uiux.spec.ts: 7 tests (创始人端 6 域导航)
- admin-uiux.spec.ts: 3 tests (Admin 6 管理域 + 商业秘密保护)
- workbench-uiux.spec.ts: 5 tests (Highlights/WorkMode/Tab/InsightRail)
- mobile-uiux.spec.ts: 5 tests (移动端抽屉导航 + 创始人底部导航)

同时修复全部 no-explicit-any 警告，替换为 TypeScript 接口定义。

测试结果: 41 E2E passed, 405 backend passed

frontend/src/app/(investor)/sentinels/page.tsx

@@ -1,19 +1,26 @@
 "use client";
 
 import { useEffect, useState } from "react";
-import { Target } from "lucide-react";
 import { listDecisionSentinels } from "@/lib/api-v2";
-import { PageContainer, Badge, TableEmpty } from "@/components/shared/PageContainer";
+import { PageContainer, Badge} from "@/components/shared/PageContainer";
 import { LoadingSpinner } from "@/components/shared/LoadingSpinner";
 import { EmptyState } from "@/components/shared/EmptyState";
 
+/** 决策前哨项。 */
+interface DecisionSentinel {
+  decision_type: string;
+  title: string;
+  status: string;
+  description?: string;
+}
+
 export default function SentinelsPage() {
-  const [items, setItems] = useState<Record<string, any>[]>([]);
+  const [items, setItems] = useState<DecisionSentinel[]>([]);
   const [isLoading, setIsLoading] = useState(true);
 
   useEffect(() => {
     listDecisionSentinels()
-      .then((resp) => setItems((resp.data as Record<string, any>[]) ?? []))
+      .then((resp) => setItems((resp.data as DecisionSentinel[]) ?? []))
       .catch(() => setItems([]))
       .finally(() => setIsLoading(false));
   }, []);
@@ -30,15 +37,15 @@ export default function SentinelsPage() {
             <div key={i} className="rounded-lg border border-gray-200 bg-white p-4">
               <div className="flex items-center justify-between">
                 <div className="flex items-center gap-2">
-                  <Badge color="blue">{item.decision_type as string}</Badge>
-                  <h3 className="font-medium text-gray-900">{item.title as string}</h3>
+                  <Badge color="blue">{item.decision_type}</Badge>
+                  <h3 className="font-medium text-gray-900">{item.title}</h3>
                 </div>
                 <Badge color={item.status === "acted" ? "green" : item.status === "analyzed" ? "amber" : "gray"}>
-                  {item.status as string}
+                  {item.status}
                 </Badge>
               </div>
               {item.description && (
-                <p className="mt-2 text-sm text-gray-600">{item.description as string}</p>
+                <p className="mt-2 text-sm text-gray-600">{item.description}</p>
               )}
             </div>
           ))}