feat(alerts): 添加微信告警、WebSocket实时推送和地图功能

- 新增微信告警服务（wechat_service）和告警任务（alert_tasks）
- 新增 WebSocket 实时推送端点
- 新增监控管理模块（monitor）
- 增强统计仪表板：趋势图、区域分布、光功率历史
- 设备管理：添加坐标信息、标签系统、复合索引优化
- 前端：重构Dashboard/Charts页面，新增业务组件
- 新增5个数据库迁移（坐标、复合索引、标签、光功率历史、显示名）
- 更新部署配置和脚本
- 新增测试框架基础结构

backend/app/tasks/alert_tasks.py

@@ -0,0 +1,82 @@
+"""告警相关 Celery 任务"""
+import traceback
+from datetime import datetime
+from sqlalchemy import func, case
+from app.core.celery_app import celery_app
+from app.core.database import SessionLocal
+
+
+@celery_app.task(queue='h3c_onu_ms', ignore_result=True)
+def check_school_offline_alerts():
+    """
+    检查是否有学校全部离线（在线率为 0%），如有则发送企业微信告警。
+    该任务在每次全量状态检查完成后异步调用。
+    """
+    from app.models.device import ONUDevice, DeviceStatusHistory
+    from app.services.wechat_service import send_wechat_markdown
+
+    db = SessionLocal()
+    try:
+        # 每台设备最新状态的子查询
+        latest_subq = (
+            db.query(
+                DeviceStatusHistory.onu_device_id,
+                func.max(DeviceStatusHistory.checked_at).label("max_checked_at")
+            )
+            .group_by(DeviceStatusHistory.onu_device_id)
+            .subquery()
+        )
+        latest_status_subq = (
+            db.query(
+                DeviceStatusHistory.onu_device_id,
+                DeviceStatusHistory.status
+            )
+            .join(
+                latest_subq,
+                (DeviceStatusHistory.onu_device_id == latest_subq.c.onu_device_id) &
+                (DeviceStatusHistory.checked_at == latest_subq.c.max_checked_at)
+            )
+            .subquery()
+        )
+
+        # 按学校聚合在线率，只查询在线数为 0 的学校
+        rows = (
+            db.query(
+                ONUDevice.school_name,
+                ONUDevice.region,
+                func.count().label("total"),
+                func.sum(case((latest_status_subq.c.status == 'online', 1), else_=0)).label("online"),
+            )
+            .outerjoin(latest_status_subq, ONUDevice.id == latest_status_subq.c.onu_device_id)
+            .group_by(ONUDevice.school_name, ONUDevice.region)
+            .having(
+                func.sum(case((latest_status_subq.c.status == 'online', 1), else_=0)) == 0
+            )
+            .all()
+        )
+
+        if not rows:
+            return {"alerted": False, "reason": "没有全离线的学校"}
+
+        # 构造告警消息
+        now_str = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
+        lines = [
+            "## <font color=\"warning\">[告警] 学校全部离线</font>",
+            f"> 检查时间：{now_str}",
+            "> 以下学校所有设备均处于离线状态：",
+            "",
+        ]
+        for row in rows:
+            school = row.school_name or "未知"
+            region = row.region or "未知"
+            total = int(row.total or 0)
+            if total > 0:
+                lines.append(f"- **{school}**（{region}）: {total} 台设备全离线")
+
+        content = "\n".join(lines)
+        send_wechat_markdown(content)
+        return {"alerted": True, "schools": len(rows)}
+    except Exception as e:
+        return {"alerted": False, "error": str(e), "traceback": traceback.format_exc()}
+    finally:
+        db.close()

backend/app/tasks/check_tasks.py

@@ -97,6 +97,16 @@ def check_all_devices(self):
 
         self.update_state(state='PROGRESS', meta={'current': total, 'total': total, 'status': '检查完成'})
 
+        # 通知 WebSocket 客户端状态已更新
+        try:
+            import json as _json
+            r.publish("h3c_onu:status_updates", _json.dumps({
+                "type": "check_complete", "total_online": total_online,
+                "total_offline": total_offline, "total_olts": total
+            }))
+        except Exception:
+            pass
+
         return {
             'success': True,
             'total_olts': total,