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/SwipeableCard.tsx

@@ -21,6 +21,7 @@ interface SwipeableCardProps {
   isTop: boolean;
   onSwipe: (direction: SwipeDirection) => void;
   registerSwipe?: (fn: (direction: SwipeDirection) => void) => void;
+  likeCount: number;
 }
 
 function SwipeOverlay({ x }: { x: MotionValue<number> }) {
@@ -54,6 +55,7 @@ export default function SwipeableCard({
   isTop,
   onSwipe,
   registerSwipe,
+  likeCount,
 }: SwipeableCardProps) {
   const x = useMotionValue(0);
   const rotate = useTransform(x, [-300, 300], [-ROTATION_RANGE, ROTATION_RANGE]);
@@ -108,7 +110,7 @@ export default function SwipeableCard({
       transition={{ type: "spring", stiffness: 300, damping: 25 }}
     >
       <SwipeOverlay x={x} />
-      <RestaurantCard restaurant={restaurant} />
+      <RestaurantCard restaurant={restaurant} likeCount={likeCount} />
     </motion.div>
   );
 }