fix: 数据分析模块修复 添加 API 端点 + 租户维度

1. 新增 GET /api/analytics 端点（之前不存在，前端一直请求 404）
2. query_optimizer.get_analytics_optimized 支持 tenant_id 参数
3. 工单/预警/对话查询按 tenant_id 过滤
4. 数据分析控制面板新增租户筛选下拉框
5. updateCharts 传递 tenant_id 参数
6. populateTenantSelectors 填充分析页租户筛选器

src/core/query_optimizer.py

@@ -236,25 +236,31 @@ class QueryOptimizer:
             logger.error(f"批量更新工单失败: {e}")
             return False
     
-    def get_analytics_optimized(self, days: int = 30) -> Dict[str, Any]:
-        """优化版分析数据查询"""
+    def get_analytics_optimized(self, days: int = 30, tenant_id: str = None) -> Dict[str, Any]:
+        """优化版分析数据查询（支持按租户筛选）"""
         start_time = time.time()
         
         try:
             with db_manager.get_session() as session:
                 from datetime import datetime, timedelta
                 
-                end_time = datetime.now()
-                start_time_query = end_time - timedelta(days=days-1)
+                # 查询工单
+                wo_query = session.query(WorkOrder)
+                if tenant_id:
+                    wo_query = wo_query.filter(WorkOrder.tenant_id == tenant_id)
+                workorders = wo_query.all()
                 
-                # 批量查询所有需要的数据
-                # 修改：查询所有工单，不限制时间范围
-                workorders = session.query(WorkOrder).all()
+                # 查询预警
+                alert_query = session.query(Alert)
+                if tenant_id:
+                    alert_query = alert_query.filter(Alert.tenant_id == tenant_id)
+                alerts = alert_query.all()
                 
-                # 修改：查询所有预警和对话，不限制时间范围
-                alerts = session.query(Alert).all()
-                
-                conversations = session.query(Conversation).all()
+                # 查询对话
+                conv_query = session.query(Conversation)
+                if tenant_id:
+                    conv_query = conv_query.filter(Conversation.tenant_id == tenant_id)
+                conversations = conv_query.all()
                 
                 # 处理数据
                 analytics = self._process_analytics_data(workorders, alerts, conversations, days)