refactor: 引入 apiHandler + ApiError，消除 20 个路由的 try/catch 样板

- 新增 src/lib/api.ts：ApiError 错误类 + apiHandler 统一包装器
- 20 个 API 路由统一使用 apiHandler，删除重复的 try/catch 块
- 验证错误改用 throw new ApiError()，减少嵌套层级
- join/manage 路由的错误码映射改为直接抛出 ApiError
- 删除已无引用的 errorResponse 辅助函数
- 净减 273 行代码

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

@@ -1,60 +1,46 @@
 import { NextResponse } from "next/server";
 import { atomicUpdateRoom } from "@/lib/store";
 import { notify } from "@/lib/roomEvents";
+import { apiHandler, ApiError } from "@/lib/api";
 
-export async function POST(
-  req: Request,
-  { params }: { params: Promise<{ id: string }> },
-) {
+export const POST = apiHandler(async (req, { params }) => {
   const { id } = await params;
+  const { userId, restaurantId } = await req.json();
 
-  try {
-    const { userId, restaurantId } = await req.json();
+  if (!userId || restaurantId == null) {
+    throw new ApiError("userId and restaurantId are required");
+  }
 
-    if (!userId || restaurantId == null) {
-      return NextResponse.json(
-        { error: "userId and restaurantId are required" },
-        { status: 400 },
-      );
+  const rid = String(restaurantId);
+
+  const updated = await atomicUpdateRoom(id, (data) => {
+    if (data.likes[rid]) {
+      data.likes[rid] = data.likes[rid].filter((u) => u !== userId);
+      if (data.likes[rid].length === 0) {
+        delete data.likes[rid];
+      }
     }
 
-    const rid = String(restaurantId);
-
-    const updated = await atomicUpdateRoom(id, (data) => {
-      if (data.likes[rid]) {
-        data.likes[rid] = data.likes[rid].filter((u) => u !== userId);
-        if (data.likes[rid].length === 0) {
-          delete data.likes[rid];
-        }
-      }
-
-      if (data.match === rid) {
-        data.match = null;
-      }
-
-      const count = data.swipeCounts[userId] ?? 0;
-      if (count > 0) {
-        data.swipeCounts[userId] = count - 1;
-      }
-
-      return data;
-    });
-
-    if (!updated) {
-      return NextResponse.json(
-        { error: "房间不存在或已过期" },
-        { status: 404 },
-      );
+    if (data.match === rid) {
+      data.match = null;
     }
 
-    notify(id);
+    const count = data.swipeCounts[userId] ?? 0;
+    if (count > 0) {
+      data.swipeCounts[userId] = count - 1;
+    }
 
-    return NextResponse.json({ ok: true });
-  } catch (e) {
-    console.error("Failed to undo swipe:", e);
+    return data;
+  });
+
+  if (!updated) {
     return NextResponse.json(
-      { error: "撤回失败" },
-      { status: 500 },
+      { error: "房间不存在或已过期" },
+      { status: 404 },
     );
   }
-}
+
+  notify(id);
+
+  return NextResponse.json({ ok: true });
+});