feat: 增加滑动参与感 - 进度条、实时气泡、热度标签

- 卡片上方显示滑动进度条和计数 (3/15)
- 轮询检测到当前卡片新增 like 时弹出"有人也想去这家！"气泡
- 卡片图片角落显示"🔥N 人想去"热度标签
- 后端 GET /api/room/[id] 新增 likeCounts 字段

src/components/RestaurantCard.tsx

@@ -1,18 +1,19 @@
 "use client";
 
 import { useCallback } from "react";
-import { Star, MapPin, Clock, ExternalLink } from "lucide-react";
+import { Star, MapPin, Clock, ExternalLink, Flame } from "lucide-react";
 import { Restaurant } from "@/types";
 
 interface RestaurantCardProps {
   restaurant: Restaurant;
+  likeCount?: number;
 }
 
 function stopAll(e: React.SyntheticEvent) {
   e.stopPropagation();
 }
 
-export default function RestaurantCard({ restaurant }: RestaurantCardProps) {
+export default function RestaurantCard({ restaurant, likeCount = 0 }: RestaurantCardProps) {
   const openLink = useCallback(
     (url: string) => (e: React.MouseEvent | React.TouchEvent) => {
       e.stopPropagation();
@@ -37,11 +38,19 @@ export default function RestaurantCard({ restaurant }: RestaurantCardProps) {
         />
         <div className="absolute inset-0 bg-linear-to-t from-black/40 via-transparent to-transparent" />
 
-        {restaurant.category && (
-          <span className="absolute bottom-3 left-4 rounded-full bg-white/90 px-2.5 py-0.5 text-xs font-semibold text-zinc-700 shadow-sm backdrop-blur-sm">
-            {restaurant.category}
-          </span>
-        )}
+        <div className="absolute bottom-3 left-4 flex items-center gap-1.5">
+          {restaurant.category && (
+            <span className="rounded-full bg-white/90 px-2.5 py-0.5 text-xs font-semibold text-zinc-700 shadow-sm backdrop-blur-sm">
+              {restaurant.category}
+            </span>
+          )}
+          {likeCount > 0 && (
+            <span className="flex items-center gap-0.5 rounded-full bg-rose-500/90 px-2 py-0.5 text-xs font-semibold text-white shadow-sm backdrop-blur-sm">
+              <Flame size={11} />
+              {likeCount} 人想去
+            </span>
+          )}
+        </div>
       </div>
 
       <div className="flex flex-1 flex-col justify-center gap-2 px-5 py-3">