feat: 移动端底部导航可配置与工作区导航、置顶后台等前端调整

frontend/app/admin/settings/MobileTabBarPanel.tsx

@@ -11,6 +11,7 @@ import { toast } from "@/lib/toast";
 const TAB_META: Record<MobileTabKey, { label: string; hint: string }> = {
   home: { label: "首页", hint: "站点首页" },
   library: { label: "书库", hint: "书库列表页入口" },
+  snippets: { label: "片段", hint: "代码片段列表页入口（默认关闭，开启后显示在底栏）" },
   compose: { label: "发帖", hint: "发帖工作台入口（中央主按钮，无对应首页）" },
   messages: { label: "消息", hint: "私聊/群聊列表；游客不显示" },
   me: { label: "我的", hint: "个人主页；未登录指向登录页" },
@@ -22,6 +23,7 @@ function switchesOf(tabs: MobileTabKey[]): TabSwitches {
   return {
     home: tabs.includes("home"),
     library: tabs.includes("library"),
+    snippets: tabs.includes("snippets"),
     compose: tabs.includes("compose"),
     messages: tabs.includes("messages"),
     me: tabs.includes("me"),
@@ -166,7 +168,7 @@ export default function MobileTabBarPanel({
         <ul className="admin-url-style-notes meta mt-1 text-[12px]">
           <li>顺序即前台底栏展示顺序；未启用的入口保留排序位置，重新启用后按当前顺序插入。</li>
           <li>至少保留一个入口；全部关闭将无法保存。</li>
-          <li>排行榜不在底栏展示，移动端入口由首页抽屉承担。</li>
+          <li>片段、排行榜未放进底栏时，移动端仍可从首页 ☰ 导航抽屉进入（片段默认关闭）。</li>
         </ul>
       </div>
     </AdminSettingsGroup>