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/hooks/useRoomPolling.ts

@@ -1,22 +1,36 @@
 "use client";
 
 import useSWR from "swr";
+import { useRef } from "react";
 import { RoomStatus } from "@/types";
 
 const fetcher = (url: string) => fetch(url).then((r) => r.json());
 
 export function useRoomPolling(roomId: string) {
-  const { data, error, isLoading } = useSWR<RoomStatus>(
+  const settled = useRef(false);
+
+  const { data, error, isLoading, mutate } = useSWR<RoomStatus>(
     `/api/room/${roomId}`,
     fetcher,
-    { refreshInterval: 1500, revalidateOnFocus: true },
+    {
+      refreshInterval: settled.current ? 0 : 1500,
+      revalidateOnFocus: true,
+    },
   );
 
+  if (data?.match != null || data?.noMatch) {
+    settled.current = true;
+  } else {
+    settled.current = false;
+  }
+
   return {
     userCount: data?.userCount ?? 0,
     match: data?.match ?? null,
+    noMatch: data?.noMatch ?? false,
     restaurants: data?.restaurants ?? [],
     isLoading,
     error,
+    mutate,
   };
 }