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)/weak-signals/page.tsx

@@ -1,12 +1,20 @@
 "use client";
 
 import { useEffect, useState } from "react";
-import { Lightbulb } from "lucide-react";
 import { listWeakSignals } 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";
 
+/** 弱信号项。 */
+interface WeakSignal {
+  signal_type: string;
+  content: string;
+  confidence: number;
+  risk_probability?: number;
+  status: string;
+}
+
 const SIGNAL_TYPE_LABELS: Record<string, string> = {
   technical: "技术",
   sentiment: "情绪",
@@ -15,12 +23,12 @@ const SIGNAL_TYPE_LABELS: Record<string, string> = {
 };
 
 export default function WeakSignalsPage() {
-  const [items, setItems] = useState<Record<string, any>[]>([]);
+  const [items, setItems] = useState<WeakSignal[]>([]);
   const [isLoading, setIsLoading] = useState(true);
 
   useEffect(() => {
     listWeakSignals()
-      .then((resp) => setItems((resp.data as Record<string, any>[]) ?? []))
+      .then((resp) => setItems((resp.data as WeakSignal[]) ?? []))
       .catch(() => setItems([]))
       .finally(() => setIsLoading(false));
   }, []);
@@ -47,20 +55,20 @@ export default function WeakSignalsPage() {
               {items.map((item, i) => (
                 <tr key={i}>
                   <td className="px-4 py-2">
-                    <Badge color="blue">{SIGNAL_TYPE_LABELS[item.signal_type as string] ?? item.signal_type}</Badge>
+                    <Badge color="blue">{SIGNAL_TYPE_LABELS[item.signal_type] ?? item.signal_type}</Badge>
                   </td>
-                  <td className="px-4 py-2 text-gray-900 max-w-xs truncate">{item.content as string}</td>
-                  <td className="px-4 py-2 text-gray-600">{((item.confidence as number) * 100).toFixed(0)}%</td>
+                  <td className="px-4 py-2 text-gray-900 max-w-xs truncate">{item.content}</td>
+                  <td className="px-4 py-2 text-gray-600">{(item.confidence * 100).toFixed(0)}%</td>
                   <td className="px-4 py-2">
                     {item.risk_probability ? (
-                      <Badge color={(item.risk_probability as number) > 0.6 ? "red" : (item.risk_probability as number) > 0.3 ? "amber" : "green"}>
-                        {((item.risk_probability as number) * 100).toFixed(0)}%
+                      <Badge color={item.risk_probability > 0.6 ? "red" : item.risk_probability > 0.3 ? "amber" : "green"}>
+                        {(item.risk_probability * 100).toFixed(0)}%
                       </Badge>
                     ) : "-"}
                   </td>
                   <td className="px-4 py-2">
                     <Badge color={item.status === "alerted" ? "red" : item.status === "correlated" ? "amber" : "gray"}>
-                      {item.status as string}
+                      {item.status}
                     </Badge>
                   </td>
                 </tr>