feat: 新增「喝什么」场景，支持奶茶/咖啡/酒吧等饮品店搜索

引入场景系统(SceneType)，首页增加「吃什么」「喝什么」切换 Tab，
不同场景使用不同的高德 POI 类型、热门标签、价格区间和全链路文案。
场景信息存储在房间数据中，邀请/分享/匹配结果等页面自动适配。

src/components/TopNav.tsx

@@ -5,7 +5,8 @@ import { Users, QrCode, LogOut, Crown, Lock } from "lucide-react";
 import { motion, AnimatePresence } from "framer-motion";
 import QrInviteModal from "./QrInviteModal";
 import RoomManageModal from "./RoomManageModal";
-import type { UserProfile } from "@/types";
+import type { UserProfile, SceneType } from "@/types";
+import { getSceneConfig } from "@/lib/sceneConfig";
 
 interface TopNavProps {
   roomId: string;
@@ -18,6 +19,7 @@ interface TopNavProps {
   swipeCounts?: Record<string, number>;
   totalCards?: number;
   userProfiles?: Record<string, UserProfile>;
+  scene?: SceneType;
 }
 
 export default function TopNav({
@@ -31,7 +33,9 @@ export default function TopNav({
   swipeCounts = {},
   totalCards = 0,
   userProfiles = {},
+  scene = "eat",
 }: TopNavProps) {
+  const sceneConfig = getSceneConfig(scene);
   const [toast, setToast] = useState("");
   const [showQr, setShowQr] = useState(false);
   const [showManage, setShowManage] = useState(false);
@@ -110,6 +114,7 @@ export default function TopNav({
         onClose={() => setShowQr(false)}
         roomId={roomId}
         onToast={showToast}
+        scene={scene}
       />
 
       {isCreator && (