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/tests/test_import_service.py

@@ -0,0 +1,42 @@
+"""数据导入服务测试"""
+import io
+import pytest
+from app.services.import_service import ImportService
+
+
+class TestImportService:
+    def test_validate_mac(self, db_session):
+        svc = ImportService(db_session)
+        valid = [{"mac_address": "1484-778f-aa60", "region": "城区", "school_name": "测试学校"}]
+        result = svc.validate_data(valid)
+        assert len(result["valid"]) == 1
+        assert len(result["invalid"]) == 0
+
+    def test_invalid_mac_rejected(self, db_session):
+        svc = ImportService(db_session)
+        data = [{"mac_address": "invalid", "region": "城区", "school_name": "测试学校"}]
+        result = svc.validate_data(data)
+        assert len(result["invalid"]) > 0
+
+    def test_missing_required_fields(self, db_session):
+        svc = ImportService(db_session)
+        # MAC format valid but empty region/school may or may not be rejected
+        # depending on validation rules — just verify it doesn't crash
+        data = [{"mac_address": "1484-778f-aa60", "region": "", "school_name": ""}]
+        result = svc.validate_data(data)
+        assert "valid" in result or "invalid" in result
+
+
+class TestCleanValue:
+    def test_strips_whitespace(self):
+        from app.services.import_service import clean_value
+        assert clean_value("  test  ") == "test"
+
+    def test_none_returns_empty(self):
+        from app.services.import_service import clean_value
+        assert clean_value(None) == ''
+
+    def test_nan_returns_empty(self):
+        from app.services.import_service import clean_value
+        import math
+        assert clean_value(float('nan')) == ''