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)/agreements/page.tsx

@@ -1,19 +1,27 @@
 "use client";
 
 import { useEffect, useState } from "react";
-import { ScrollText, Plus } from "lucide-react";
+import {Plus } from "lucide-react";
 import { listAgreements } from "@/lib/api-v2";
 import { PageContainer, Badge, TableEmpty } from "@/components/shared/PageContainer";
 import { LoadingSpinner } from "@/components/shared/LoadingSpinner";
 import { EmptyState } from "@/components/shared/EmptyState";
 
+/** 投资协议项。 */
+interface Agreement {
+  title: string;
+  signed_at: string;
+  status: string;
+  key_clauses?: unknown[];
+}
+
 export default function AgreementsPage() {
-  const [items, setItems] = useState<Record<string, any>[]>([]);
+  const [items, setItems] = useState<Agreement[]>([]);
   const [isLoading, setIsLoading] = useState(true);
 
   useEffect(() => {
     listAgreements()
-      .then((resp) => setItems((resp.data as Record<string, any>[]) ?? []))
+      .then((resp) => setItems((resp.data as Agreement[]) ?? []))
       .catch(() => setItems([]))
       .finally(() => setIsLoading(false));
   }, []);
@@ -49,15 +57,15 @@ export default function AgreementsPage() {
               ) : (
                 items.map((item, i) => (
                   <tr key={i}>
-                    <td className="px-4 py-2 text-gray-900">{item.title as string}</td>
-                    <td className="px-4 py-2 text-gray-600">{item.signed_at as string}</td>
+                    <td className="px-4 py-2 text-gray-900">{item.title}</td>
+                    <td className="px-4 py-2 text-gray-600">{item.signed_at}</td>
                     <td className="px-4 py-2">
                       <Badge color={item.status === "active" ? "green" : "gray"}>
-                        {item.status as string}
+                        {item.status}
                       </Badge>
                     </td>
                     <td className="px-4 py-2 text-gray-500">
-                      {Array.isArray(item.key_clauses) ? (item.key_clauses as unknown[]).length : 0} 条
+                      {Array.isArray(item.key_clauses) ? item.key_clauses.length : 0} 条
                     </td>
                   </tr>
                 ))