refactor(P0): JWT 认证、并发安全、错误日志三项安全加固

- 新增 JWT httpOnly cookie 认证链路 (jose)，登录/注册签发 token，
  所有用户和盲盒 API 改为从 cookie 提取 userId，不再信任客户端传值
- 新增 /api/auth/logout 端点清除认证 cookie
- GET /api/user 区分 owner/非 owner，非 owner 不暴露 email
- atomicUpdateRoom 新增 per-room 应用层互斥锁，防止 SQLite 下并发 lost update
- 修复 getRoomData 中 fire-and-forget delete 改为 await
- 37 个静默 catch 块跨 17 个文件添加 console.error 日志
- 新增 REFACTOR_PLAN.md 全景分析文档

src/app/api/blindbox/suggest/route.ts

@@ -1,18 +1,18 @@
 import { NextResponse } from "next/server";
 import { prisma } from "@/lib/prisma";
 import { requireMembership } from "@/lib/blindbox";
-import { apiHandler, ApiError, requireUserId } from "@/lib/api";
+import { apiHandler, ApiError } from "@/lib/api";
+import { getAuthUserId } from "@/lib/auth";
 import { suggestIdeas } from "@/lib/ai";
 
 export const GET = apiHandler(async (req) => {
+  const userId = await getAuthUserId(req);
   const { searchParams } = new URL(req.url);
   const roomId = searchParams.get("roomId");
-  const userId = searchParams.get("userId");
 
-  requireUserId(userId);
   if (!roomId) throw new ApiError("roomId 不能为空");
 
-  await requireMembership(roomId, userId!);
+  await requireMembership(roomId, userId);
 
   const recentIdeas = await prisma.blindBoxIdea.findMany({
     where: { roomId, status: "in_pool" },