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/lib/api.ts

@@ -12,7 +12,11 @@ export class ApiError extends Error {
   }
 }
 
-/** Validates that value is a non-empty string; throws 401 otherwise. */
+/**
+ * Validates that value is a non-empty string; throws 401 otherwise.
+ * Used for room routes where anonymous users pass userId in body.
+ * For registered-user routes, prefer getAuthUserId() from lib/auth.
+ */
 export function requireUserId(value: unknown): string {
   if (!value || typeof value !== "string") {
     throw new ApiError("请先登录", 401);