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/api/room/[id]/join/route.ts

@@ -1,5 +1,5 @@
 import { NextResponse } from "next/server";
-import { getRoomData, updateRoomData } from "@/lib/store";
+import { atomicUpdateRoom } from "@/lib/store";
 
 export async function POST(
   req: Request,
@@ -8,28 +8,28 @@ export async function POST(
   const { id } = await params;
 
   try {
-    const data = await getRoomData(id);
+    const { userId } = await req.json();
+    if (!userId) {
+      return NextResponse.json({ error: "userId required" }, { status: 400 });
+    }
 
-    if (!data) {
+    const updated = await atomicUpdateRoom(id, (data) => {
+      if (!data.users.includes(userId)) {
+        data.users.push(userId);
+      }
+      return data;
+    });
+
+    if (!updated) {
       return NextResponse.json(
         { error: "房间不存在或已过期" },
         { status: 404 },
       );
     }
 
-    const { userId } = await req.json();
-    if (!userId) {
-      return NextResponse.json({ error: "userId required" }, { status: 400 });
-    }
-
-    if (!data.users.includes(userId)) {
-      data.users.push(userId);
-      await updateRoomData(id, data);
-    }
-
     return NextResponse.json({
       roomId: id,
-      userCount: data.users.length,
+      userCount: updated.users.length,
     });
   } catch (e) {
     console.error("Failed to join room:", e);

src/app/api/room/[id]/reset/route.ts

@@ -0,0 +1,33 @@
+import { NextResponse } from "next/server";
+import { atomicUpdateRoom } from "@/lib/store";
+
+export async function POST(
+  _req: Request,
+  { params }: { params: Promise<{ id: string }> },
+) {
+  const { id } = await params;
+
+  try {
+    const updated = await atomicUpdateRoom(id, (data) => {
+      data.likes = {};
+      data.swipeCounts = {};
+      data.match = null;
+      return data;
+    });
+
+    if (!updated) {
+      return NextResponse.json(
+        { error: "房间不存在或已过期" },
+        { status: 404 },
+      );
+    }
+
+    return NextResponse.json({ ok: true });
+  } catch (e) {
+    console.error("Failed to reset room:", e);
+    return NextResponse.json(
+      { error: "重置失败" },
+      { status: 500 },
+    );
+  }
+}

src/app/api/room/[id]/route.ts

@@ -17,10 +17,17 @@ export async function GET(
       );
     }
 
+    const total = data.restaurants.length;
+    const allFinished =
+      data.users.length > 0 &&
+      data.users.every((u) => (data.swipeCounts[u] ?? 0) >= total);
+    const noMatch = allFinished && data.match === null;
+
     return NextResponse.json({
       roomId: id,
       userCount: data.users.length,
       match: data.match,
+      noMatch,
       restaurants: data.restaurants,
     });
   } catch (e) {

src/app/api/room/[id]/swipe/route.ts

@@ -1,5 +1,5 @@
 import { NextResponse } from "next/server";
-import { getRoomData, updateRoomData } from "@/lib/store";
+import { atomicUpdateRoom } from "@/lib/store";
 
 export async function POST(
   req: Request,
@@ -8,15 +8,6 @@ export async function POST(
   const { id } = await params;
 
   try {
-    const data = await getRoomData(id);
-
-    if (!data) {
-      return NextResponse.json(
-        { error: "房间不存在或已过期" },
-        { status: 404 },
-      );
-    }
-
     const { userId, restaurantId, action } = await req.json();
 
     if (!userId || restaurantId == null || !action) {
@@ -27,33 +18,39 @@ export async function POST(
     }
 
     const rid = String(restaurantId);
-    let dirty = false;
 
-    if (action === "like") {
-      if (!data.likes[rid]) {
-        data.likes[rid] = [];
-      }
-      if (!data.likes[rid].includes(userId)) {
-        data.likes[rid].push(userId);
-        dirty = true;
+    const updated = await atomicUpdateRoom(id, (data) => {
+      if (action === "like") {
+        if (!data.likes[rid]) {
+          data.likes[rid] = [];
+        }
+        if (!data.likes[rid].includes(userId)) {
+          data.likes[rid].push(userId);
+        }
+
+        if (
+          data.users.length > 1 &&
+          data.likes[rid].length === data.users.length
+        ) {
+          data.match = rid;
+        }
       }
 
-      if (
-        data.users.length > 1 &&
-        data.likes[rid].length === data.users.length
-      ) {
-        data.match = rid;
-        dirty = true;
-      }
-    }
+      data.swipeCounts[userId] = (data.swipeCounts[userId] ?? 0) + 1;
 
-    if (dirty) {
-      await updateRoomData(id, data);
+      return data;
+    });
+
+    if (!updated) {
+      return NextResponse.json(
+        { error: "房间不存在或已过期" },
+        { status: 404 },
+      );
     }
 
     return NextResponse.json({
-      match: data.match,
-      likeCount: data.likes[rid]?.length ?? 0,
+      match: updated.match,
+      likeCount: updated.likes[rid]?.length ?? 0,
     });
   } catch (e) {
     console.error("Failed to process swipe:", e);