test: add comprehensive test suite for server

- Add load testing with Artillery (smoke, standard, peak, stress)
- Add functional tests: voting, lottery, admin (18 tests)
- Add fault tolerance tests (14 tests)
- Add network tests for WebSocket (7 tests)
- Add compatibility tests (15 tests)
- Add security tests: anti-fraud, auth, data integrity (10 tests)
- Fix optional callback handling in socket handlers
- Total: 64 test cases, all passing

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/server/load-test/README.md

@@ -0,0 +1,132 @@
+# 年会互动大屏系统 - 压力测试指南
+
+## 快速开始
+
+### 1. 安装依赖
+```bash
+cd packages/server
+pnpm add -D artillery @artilleryio/engine-socketio-v3
+```
+
+### 2. 确保服务运行
+```bash
+# 根目录启动所有服务
+pnpm dev
+
+# 或仅启动服务端
+pnpm dev:server
+```
+
+### 3. 运行压测
+```bash
+# 冒烟测试 (快速验证)
+pnpm test:load:smoke
+
+# 标准测试
+pnpm test:load
+
+# 重压模式 (200并发，对应需求规格书验收标准)
+pnpm test:load:heavy
+
+# 脉冲测试 (模拟现场投票热潮)
+pnpm test:load:pulse
+```
+
+---
+
+## 测试模式说明
+
+| 模式 | 命令 | 并发量 | 持续时间 | 用途 |
+|------|------|--------|----------|------|
+| `smoke` | `pnpm test:load:smoke` | 5 | 5s | 快速验证配置 |
+| `standard` | `pnpm test:load` | 50 | 20s | 日常开发测试 |
+| `heavy` | `pnpm test:load:heavy` | 200 | 35s | **验收标准 (150人并发)** |
+| `pulse` | `pnpm test:load:pulse` | 150-200 | 21s | 模拟现场脉冲式投票 |
+
+---
+
+## 验收标准
+
+根据 `年会互动大屏系统需求规格说明书.md`：
+
+| 指标 | 目标值 | 检查方式 |
+|------|--------|----------|
+| 并发连接 | 200+ | Artillery 报告 `vusers.session_length` |
+| QPS | > 1000 | 报告 `socketio.emit_rate` |
+| 延迟 P95 | < 500ms | 报告 `socketio.response_time.p95` |
+| 错误率 | < 1% | 报告 `vusers.failed` / `vusers.completed` |
+| Redis 计数 | 准确无丢票 | 对比 Redis 统计与预期投票数 |
+
+---
+
+## 报告输出
+
+测试完成后会输出类似以下报告：
+
+```
+All VUs finished. Total time: 35 seconds
+
+--------------------------------
+Summary report @ 16:30:00(+0800)
+--------------------------------
+
+socketio.emit: ..................... 5000
+socketio.emit_rate: ................ 142.86/sec
+socketio.response_time:
+  min: ............................. 12
+  max: ............................. 456
+  median: .......................... 48
+  p95: ............................. 189
+  p99: ............................. 312
+
+vusers.completed: .................. 200
+vusers.created: .................... 200
+vusers.created_by_name.完整投票流程: 140
+vusers.created_by_name.快速连投压力: 40
+vusers.created_by_name.观望用户: .... 20
+vusers.failed: ..................... 0
+vusers.session_length:
+  min: ............................. 2500
+  max: ............................. 6800
+  median: .......................... 3400
+  p95: ............................. 5200
+  p99: ............................. 6100
+```
+
+---
+
+## 高级用法
+
+### 生成 HTML 报告
+```bash
+npx artillery run packages/server/load-test/vote-load-test.yaml \
+  --output report.json && \
+  npx artillery report report.json
+```
+
+### 指定环境运行
+```bash
+npx artillery run packages/server/load-test/vote-load-test.yaml -e heavy
+```
+
+### 调试模式 (查看详细日志)
+```bash
+DEBUG=socketio:* npx artillery run packages/server/load-test/vote-load-test.yaml -e smoke
+```
+
+---
+
+## 故障排查
+
+### 1. 连接失败
+- 检查服务端是否运行在 `localhost:3000`
+- 确认 CORS 配置允许本地访问
+
+### 2. 投票被拒绝 (VOTING_CLOSED)
+- 确保导播台已开启投票通道
+- 或临时修改服务端绕过投票状态检查
+
+### 3. 性能不达标
+- 检查 Redis 连接是否正常
+- 确认未在调试模式运行
+- 考虑增加 Node.js 内存限制: `NODE_OPTIONS="--max-old-space-size=4096"`