fix: 修复竞态条件、重置逻辑、无匹配终态等关键问题

- 用 Prisma $transaction 实现 atomicUpdateRoom，防止并发写入覆盖
- 新增 POST /api/room/[id]/reset 端点，修复"再来一轮"按钮死循环
- 新增 swipeCounts 字段追踪滑动进度，检测"无人匹配"终态
- 着陆页 handleCreate 增加 res.ok 检查，防止跳转到无效房间
- 匹配或无匹配后停止轮询，减少无效请求

src/app/room/[id]/page.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { useEffect, useState } from "react";
+import { useEffect, useState, useCallback } from "react";
 import { useParams } from "next/navigation";
 import TopNav from "@/components/TopNav";
 import SwipeDeck from "@/components/SwipeDeck";
@@ -14,7 +14,8 @@ export default function RoomPage() {
   const [userId, setUserId] = useState("");
   const [joined, setJoined] = useState(false);
 
-  const { userCount, match, restaurants } = useRoomPolling(roomId);
+  const { userCount, match, noMatch, restaurants, mutate } =
+    useRoomPolling(roomId);
 
   useEffect(() => {
     const id = getUserId();
@@ -27,6 +28,11 @@ export default function RoomPage() {
     }).then(() => setJoined(true));
   }, [roomId]);
 
+  const handleReset = useCallback(async () => {
+    await fetch(`/api/room/${roomId}/reset`, { method: "POST" });
+    await mutate();
+  }, [roomId, mutate]);
+
   const ready = joined && userId && restaurants.length > 0;
 
   if (!ready) {
@@ -46,6 +52,8 @@ export default function RoomPage() {
         roomId={roomId}
         userId={userId}
         matchedRestaurantId={match}
+        noMatch={noMatch}
+        onReset={handleReset}
       />
     </div>
   );