feat: 敏感词管理页面（脱敏词后台化，限 lqq 账号）

- 后端 /api/sensitive-words：全局共享词表，开放读、admin 或 lqq 整体替换写
- 前端 desensitize 种子化：SEED_DESENSITIZE_MAP + 运行时 replaceDesensitizeMap
- 启动加载后台配置回灌脱敏映射；管理页支持增删改启停 + 一键导入种子词
- 入口置于左下角设置下拉（全量/简洁两种侧边栏均有），仅用户名 lqq 可见

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend-web/src/pages/StrategyRoutes.tsx

@@ -2,7 +2,7 @@ import { Navigate, Route, Routes, useParams } from "react-router-dom";
 import { Toaster } from "sonner";
 
 import { SidebarProvider } from "@/components/ui/sidebar";
-import { getStoredAuth } from "@/core/auth";
+import { getAccountDisplayName, getStoredAuth } from "@/core/auth";
 import { RouteBaseProvider } from "@/core/route-base";
 import GeneralQA from "@/strategy-components/components/chat-qa/GeneralQA";
 import SentimentAnalyzes from "@/strategy-components/components/task-components/SentimentAnalyzes";
@@ -32,6 +32,7 @@ import LightAppIframeView from "./LightAppIframeView";
 import LightAppListPage from "./LightAppListPage";
 import LightAppManagementPage from "./LightAppManagementPage";
 import MenuManagementPage from "./MenuManagementPage";
+import SensitiveWordsPage from "./SensitiveWordsPage";
 import LightAppNewNotePage from "./LightAppNewNotePage";
 import LightAppNoteListPage from "./LightAppNoteListPage";
 import LightAppNoteQAPage from "./LightAppNoteQAPage";
@@ -321,6 +322,16 @@ export default function StrategyRoutes() {
                 )
               }
             />
+            <Route
+              path="admin/sensitive-words"
+              element={
+                getAccountDisplayName().toLowerCase() === "lqq" ? (
+                  <SensitiveWordsPage />
+                ) : (
+                  <Navigate to="/page/workspace/chats/new" replace />
+                )
+              }
+            />
             <Route
               path="admin/scheduled-tasks"
               element={