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/user/history/route.ts

@@ -1,13 +1,12 @@
-import { NextRequest, NextResponse } from "next/server";
+import { NextResponse } from "next/server";
 import { prisma } from "@/lib/prisma";
+import { apiHandler, ApiError } from "@/lib/api";
 
 const MAX_HISTORY = 50;
 
-export async function GET(req: NextRequest) {
+export const GET = apiHandler(async (req) => {
   const userId = req.nextUrl.searchParams.get("userId");
-  if (!userId) {
-    return NextResponse.json([]);
-  }
+  if (!userId) return NextResponse.json([]);
 
   const decisions = await prisma.decision.findMany({
     where: { userId },
@@ -26,20 +25,18 @@ export async function GET(req: NextRequest) {
       createdAt: d.createdAt.toISOString(),
     })),
   );
-}
+});
 
-export async function POST(req: NextRequest) {
+export const POST = apiHandler(async (req) => {
   const { userId, roomId, restaurant, matchType, participants } =
     await req.json();
 
   if (!userId || !roomId || !restaurant || !matchType) {
-    return NextResponse.json({ error: "缺少必要字段" }, { status: 400 });
+    throw new ApiError("缺少必要字段");
   }
 
   const user = await prisma.user.findUnique({ where: { id: userId } });
-  if (!user) {
-    return NextResponse.json({ error: "用户未注册" }, { status: 404 });
-  }
+  if (!user) throw new ApiError("用户未注册", 404);
 
   const existing = await prisma.decision.findFirst({
     where: { userId, roomId },
@@ -73,4 +70,4 @@ export async function POST(req: NextRequest) {
   }
 
   return NextResponse.json({ id: decision.id });
-}
+});