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/blindbox/draw/route.ts

@@ -1,51 +1,42 @@
-import { NextRequest, NextResponse } from "next/server";
+import { NextResponse } from "next/server";
 import { prisma } from "@/lib/prisma";
-import { errorResponse, validateMembership } from "@/lib/blindbox";
+import { validateMembership } from "@/lib/blindbox";
+import { apiHandler, ApiError } from "@/lib/api";
 
-export async function POST(req: NextRequest) {
-  try {
-    const { roomId, userId } = await req.json();
+export const POST = apiHandler(async (req) => {
+  const { roomId, userId } = await req.json();
 
-    if (!userId || typeof userId !== "string") {
-      return errorResponse("请先登录", 401);
-    }
-    if (!roomId || typeof roomId !== "string") {
-      return errorResponse("roomId 不能为空", 400);
-    }
+  if (!userId || typeof userId !== "string") throw new ApiError("请先登录", 401);
+  if (!roomId || typeof roomId !== "string") throw new ApiError("roomId 不能为空");
 
-    const isMember = await validateMembership(roomId, userId);
-    if (!isMember) {
-      return errorResponse("你不是这个房间的成员", 403);
-    }
+  const isMember = await validateMembership(roomId, userId);
+  if (!isMember) throw new ApiError("你不是这个房间的成员", 403);
 
-    const pool = await prisma.blindBoxIdea.findMany({
-      where: { roomId, status: "in_pool" },
-      select: { id: true },
-    });
+  const pool = await prisma.blindBoxIdea.findMany({
+    where: { roomId, status: "in_pool" },
+    select: { id: true },
+  });
 
-    if (pool.length === 0) {
-      return errorResponse("盒子是空的，先往里面塞点想法吧！", 404);
-    }
-
-    const picked = pool[Math.floor(Math.random() * pool.length)];
-
-    const idea = await prisma.blindBoxIdea.update({
-      where: { id: picked.id },
-      data: { status: "drawn", drawnById: userId },
-      include: {
-        user: { select: { id: true, username: true, avatar: true } },
-        drawnBy: { select: { id: true, username: true, avatar: true } },
-      },
-    });
-
-    return NextResponse.json({
-      id: idea.id,
-      content: idea.content,
-      createdAt: idea.createdAt,
-      submitter: idea.user,
-      drawnBy: idea.drawnBy,
-    });
-  } catch {
-    return errorResponse("抽取失败", 500);
+  if (pool.length === 0) {
+    throw new ApiError("盒子是空的，先往里面塞点想法吧！", 404);
   }
-}
+
+  const picked = pool[Math.floor(Math.random() * pool.length)];
+
+  const idea = await prisma.blindBoxIdea.update({
+    where: { id: picked.id },
+    data: { status: "drawn", drawnById: userId },
+    include: {
+      user: { select: { id: true, username: true, avatar: true } },
+      drawnBy: { select: { id: true, username: true, avatar: true } },
+    },
+  });
+
+  return NextResponse.json({
+    id: idea.id,
+    content: idea.content,
+    createdAt: idea.createdAt,
+    submitter: idea.user,
+    drawnBy: idea.drawnBy,
+  });
+});