feat(alert): A2 告警引擎分布式安全 — Redis 分布式锁(SetNX)

- Cache 接口新增 SetNX 方法(go-redis 原子 / redka check-then-set 单副本安全)
- AlertEngine 改造为支持分布式锁: tryAcquireLock/releaseLock/GetEngineStatus
- 多副本部署时仅 Leader 执行告警检查, 60s TTL 防死锁, fail-open 容错
- 新增 GET /alerts/engine/status 监控端点(is_leader/instance_id/lock_holder)
- 修复 GrafanaDashboard.tsx Panel.options 类型不匹配导致构建中断
- 同步未提交的前端类型安全迁移(140+ 文件)
- ROADMAP/TDD_PLAN/PROJECT_EVALUATION 三文档同步更新

验证: go build 零错误, Docker 部署 healthy, 引擎状态端点正常,
锁竞争测试通过(非 Leader 跳过检查), 5/5 核心 API 回归通过
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@@ -340,6 +340,52 @@ curl -s -X POST "http://127.0.0.1:8080/api/v1/servers" \
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## P2-A2: 告警引擎分布式安全
### 验证用例
```bash
TOKEN=$(python3 -c "
import urllib.request, json
login_data = json.dumps({'username': 'admin', 'password': '123456'}).encode()
req = urllib.request.Request('http://127.0.0.1:8080/api/v1/auth/login', data=login_data, method='POST')
req.add_header('Content-Type', 'application/json')
resp = urllib.request.urlopen(req)
print(json.loads(resp.read())['data']['token'])
")
# U1: 引擎状态端点
curl -s http://127.0.0.1:8080/api/v1/alerts/engine/status \
-H "Authorization: Bearer $TOKEN" | python3 -m json.tool
# 期望: code=200, distributed=true, is_leader=true, instance_id 非空
# U2: 模拟其他副本持有锁 — 引擎应识别为非 Leader
docker exec aiops-redis redis-cli SET aiops:alert_engine:lock "ae-OTHER" EX 40
curl -s http://127.0.0.1:8080/api/v1/alerts/engine/status \
-H "Authorization: Bearer $TOKEN" | python3 -c "import json,sys; d=json.load(sys.stdin)['data']; print(f'is_leader={d[\"is_leader\"]} lock_holder={d[\"lock_holder\"]}')"
# 期望: is_leader=False, lock_holder=ae-OTHER
# U3: 等待 35s,验证引擎跳过检查(日志输出)
sleep 35
docker logs aiops 2>&1 | grep "AlertEngine.*非 Leader" | tail -1
# 期望: [AlertEngine] 非 Leader 副本(xxx),跳过本轮检查
# U4: 释放锁,引擎恢复 Leader
docker exec aiops-redis redis-cli DEL aiops:alert_engine:lock
curl -s http://127.0.0.1:8080/api/v1/alerts/engine/status \
-H "Authorization: Bearer $TOKEN" | python3 -c "import json,sys; d=json.load(sys.stdin)['data']; print(f'is_leader={d[\"is_leader\"]}')"
# 期望: is_leader=True
```
### 通过标准
- [x] U1: 引擎状态端点返回 distributed/is_leader/instance_id/lock_ttl_sec
- [x] U2: 其他副本持锁时正确识别为非 Leader
- [x] U3: 日志确认引擎跳过检查(非 Leader 副本不执行告警扫描)
- [x] U4: 锁释放后恢复 Leader 角色
- [x] `go build` 零错误,5/5 核心 API 回归通过
---
## 回归测试基线(每次改动后必跑)
```bash